technology assessment task
Contents
1. the board Fit and solder all components take care that the components are fitted correctly as far as polarities and lead identification is concerned all components should be prepared by bending at 90 the leads to the correct spacing between holes on veroboard SAFETY PRECAUTIONS WITH SEMICONDUCTORS Diodes and transistors can be damaged by the heat of soldering When their pigtail leads must be soldered into a circuit each lead should be grasped firmly with a long nose pliers The pliers tips should be close to the body of the diode or transistor the large metallic mass of the pliers serves to conduct heat away from the component preventing its entry inside where it could do damage Continue to hold the lead with the pliers until there is no doubt that the joint has cooled completely ASSESSMENT ACTIVITY Nr 8 SOLDERING OF COMPONENTS ON THE BOARD 20 LEVEL CRITERIA 1 2 3 4 surface around the component Joints partly enclosed in Joints partly enclosed in Joints entirely enclosed in Joints entirely enclosed in leads blobs of solder solder solder but all solder yet the contours of exhibiting all the the junction is contours of the not exhibited junction Solder joint Solder joint Some solder Most of the All solder joints concave convex joints are solder joints concave around concave concave all conductors Brightness and Solder joints a2. compare collect present and compare collect present and compare 115 present and compare information information information information Designs Highly developed in the skill of Good skills of planning reflected by Skills of planning are reflected by Very basic or lack of skills of X4 planning reflected by Ability to state intent design A basic ability to state intent planning are reflected by Ability to state intent explicitly brief and further include parameters design brief and a need to be A constant need to be prompted design brief and further include specifications prompted on parameters to state intent design brief and quality parameters specifications A good variety of alternative specifications parameters specifications A good variety of detailed quality solutions Limited solutions not always Little or no alternative solutions alternative solutions Well thought out and articulated alternative Absence of reasons for choices Well thought out and articulated reasons for choices made Reasons for choices made not well The chosen solution is not well reasons for choices made An appropriate development of thought out or non existent developed A detailed and appropriate chosen solution The chosen solution is not well development of chosen solution developed 20 Makes Highly developed in the skill of Good skills of Manufacturing Skills of Manufacturing are reflected Very basic or lack of S
3. to the sides of the board 8 Polarity and identification marks must were applicable be indicated on the design N 16 ASSESSMENT ACTIVITY COMMUNICATION Nr 4 DESIGN LAYOUT OF PROJECT container Draw the complete layout of the container to accommodate all components DESIGN LAYOUT OF PROJECT container LEVEL CRITERIA 1 2 3 4 Style of A very low level A satisfactory A high levelof A very high presentation of ability that is level of ability ability that level of ability evident in that shows a shows that shows Work that is limited understanding understanding incomplete and understanding of of does not show of Acceptable Positioning of understanding of Positioning of positioning of views positioning views views The use of views and or Aspects to be A limited range positive and aspects to be considered in of negative space considered in presentations considerations Aesthetic presentations in presentations considerations in presentations Presentation A very low level A satisfactory A High level of A very high of skill evident level of skill skill evident in level of skill in drawings that evident in drawing that evident in Is incomplete drawing that Satisfies size drawing that and shows little almost fulfils the and or shape is perfect attention to size size and shape Show some according to size shape accuracy deviations in amp shape accuracy Use of A very low level
4. 1 TECHNOLOGY ASSESSMENT TASK CAPABILITY TASK KEEPING IT CONNECTED LEARNING OUTCOMES e LO 1 Technological processes and skills e LO 2 Knowledge and understanding of electronic systems e LO3 Technology society and the environment ASSESSMENT STANDARDS 9 1 1 1 Identifies and explains a problem need or opportunity from a given real life context and investigates the context the nature of the need the environmental situation and the people concerned 9 1 1 2 Analyses existing products relevant to an identified problem need or opportunity based on safety suitability of materials fitness for purpose cost manufacturing method 9 1 1 3 Develops and performs practical testing procedures to determine or compare the suitability or fitness for purpose of relevant properties of materials electrical or mechanical systems structures processes or finished products 9 1 2 1 Writes or communicates a short and clear statement or a design brief for the development of a product or system related to a context problem need or opportunity that has been identified by self 9 1 2 2 Lists product and design specifications and constraints for a solution to an identified problem need or opportunity based on all of the design key words listed below people age target market human rights access e purpose function what product will do appearance and aesthetics form colour shape feel e environment where product will be used or ma
5. 1 Produces evidence that details opinions backed up by factual evidence about bias e g gender age access in making technological decisions and suggests strategies for redress FORM S OF ASSESSMENT e Project KNOWLEDGE SKILLS VALUES simple electronic circuits and devices outputs responding to an input signal e g resistors light emitting diodes transistors push or magnetic switches thermistors light dependent Technological process skills Investigate design make and evaluate communicate using circuit and systems diagrams Soldering the impact of technological developments on the quality of people s lives and on the environment in which they live strategies for reducing any undesirable effects resistors Circuit and systems diagrams gender biase in technology DESIGN SITUATION SCENARIO AS a young person in today s electronic age it is becoming important for people to identify components of electronic devices that are not working in an electronic electrical system During the resent power outages a number of electronic electrical equipment in your house is no longer working A Circuit Tester would be a useful device to have at home to do fault finding on electronic circuits You will be issued with the electronic components to build a circuit for a circuit tester but a housing will be needed for the assembled device to make it functional and user frie
6. A level of A high level of A very high correct acceptab of knowledge amp knowledge amp knowledge amp level of le conventions application of drawing conventions that is evident in Incomplete work that shows little attention to the use of acceptable line types and the techniques of dimensioning sectioning and naming labelling application of drawing conventions that is evident in most drawings in terms of the incorrect use of Line types Dimensioning techniques Sectioning techniques application of drawing conventions that is evident in some drawings in terms of the correct use of Line types Dimensioning techniques Sectioning techniques knowledge amp application of drawing conventions that is evident in all drawings in terms of the consistent correct use of Line types Dimensioning techniques Naming Labelling techniques Sectioning techniques 17 ASSESSMENT ACTIVITY Nr 5 DESIGN OF PC BOARD LAYOUT Design a VEROBOARD circuit layout for a CONTINUITY TESTER by making use of the circuit diagram below Figure 3 11 Figure 3 11 Led CURRENT LIMITTING RESISTOR POWER SOURCE 9V BATTERY TEST LEADS 18 ASSESSMENT ACTIVITY Nr 6 PREPARATION OF THE VEROBOARD Square and finished off Veroboard to exactly 60 mm x 17 mm Avoid touching board with your fingers as this makes it greasy Break the copper strips where applicable with 3 0 mm twist drill
7. LOUR CODE CHART 1 st 2 nd Value Colour Significant Significant Multiplier Tolerance Figure Figure 0 Black 0 1 Brown 1 1 10 1 2 Red 2 2 100 2 3 Orange 3 3 1000 4 Yellow 4 4 10000 5 Green 5 5 100 000 6 Blue 6 6 1000 000 7 Violet fi 7 10 000 000 8 Grey 8 8 100 000 000 9 White 9 9 1000000000 Silver 10 Gold 5 3 3 Figure The E12 series is a typical example where there are only 12 values and multiples of those 12 values in the series 10 12 15 18 22 27 33 47 56 68 74 82 accuracy tolerance 20 this series will cover the full range of every possible value ASSESSMENT ACTIVITY Nr 1 With an Complete the table below by establishing the resistance value with the aid of the colour code Colour coded value of resistor Numeric value of resistor Assessment No Fist Second Third Fourth First Second Third Percentace Value Mark Colour colour Colour Colour Digit Digit Digit tolerance allocation 1 Red Red Red Gold 2 Brown Black Orange Silver 3 Yellow Vilot Yellow Gold 4 Green Blue Brown Gold CRITERIA 1 mark per correct answer 5 x 4 20 Total 2 4 SWITCH In a Mechanical switch a force has to be applied to bring together or separate electrical conducting metal contacts The following contact configurations are used as examples of poles no of circuits and throws no of
8. alternative connections for Toggle switches SPST single pole single throw single pole on off CIRCUIT SYMBOL PICTORIAL VIEW Figure 3 4a Figure 3 4b 2 5 BASIC ELECTRIC CIRCUIT understand concepts such as conductivity and insulation An Electric circuit is a complete electrical path that will make it possible for an electric current Amperes denoted with the letter I to flow from the positive terminal of a battery through the conductors and components to the negative terminal The battery supplies the force electrical VOLTAGE and is denoted with the letter V A basic electric circuit consist of die following e a Power supply cell or battery Energy source e Conductors usually insulated e Switch when the switch is closed we have a completed circuit e A load eg lamp resistor electric motor etc RESISTOR POWER SOURCE 9V BATTERY SWITCH Figure 3 5 10 ASSESSMENT ACTIVITY Nr 2 Construct the basic electric circuit as per diagram above in Figure 3 5 STEPS 1 Connect the plus of the power supply 9 volt battery to the one side of the switch 2 Connect the other side of the switch to the resistor 1000 ohm 3 Connect the other side of the 1000 ohm resistor to the minus of the power supply the of the 9 volt battery Assessment criteria 1 mark per step correctly executed 3x 1 3 Total 2 6 LIGHT EMITTING DIODE A LED light emitting diode allows current flow through is in on
9. complex level the appropriate level X3 15 LO3 Shows accurate evidence of having Shows accurate evidence of having Shows some evidence of having Shows little evidence of having Technol Societ d considered all the relevant factors considered relevant factors that considered factors that partially considered factors that impact on ecnno ogy ociety an that impact on the inter relationship mostly impact on the inter impact on the inter relationship the inter relationship between the Environment between Science Technology relationship between Science between Science Technology Science Technology Society and X2 Society and the Environment at a Technology Society and the Society and the Environment at an the Environment at a level lower complex level Environment at an appropriate level appropriate level than the appropriate level 10 COMMENT 100 LEARNER PARENT TEACHER Date SUMMARY CODE PER LEARNING OUTCOME LO1 LO2 LO 3 CODE ACHEIVED LEARNER TEACHER PARENT DATE 5 TECHNOLOGY ASSESSMENT TASK INDEX DESCRIPTION PAGE No 1 OUTCOME 1 2 INTRODUCTION TO MATERIALS AND COMPONENTS 2 2 1 Cells 2 2 2 Batteries 2 2 3 Resistors 3 e Assessment activity No 1 colour code of resistors 4 2 4 Switch 4 2 5 Basic Electric Circuit 5 e Assessment activity No 2 circuit construction 5 2 6 Light emitting diode 6 2 7 A light emitting diode circuit 6 2 8 Veroboard 9 2 9 Plastic box 9 2 10 Soldering 10 e Assessment ac
10. de impact on the environment in the long and short term safety for users and manufacturers cost cost of materials wastage cost of manufacture maximum selling price ergonomics quality production mass production batch production one off production 9 1 2 3 Generates a range of possible solutions that are significantly different from each other and that show clear links to the design brief and the specifications and constraints 9 1 2 4 Chooses possible solutions based on well reasoned argument related to the specifications and personal opinions and develops a chosen idea using graphics 9 1 3 1 Develops plans for making that include all of the following resource lists e g materials lists tools people costs formal drawing 9 1 3 2 Chooses and uses appropriate tools and materials to make designed products with precision and control by measuring marking cutting or separating shaping or forming joining or combining and finishing a range of materials accurately and efficiently showing dimensions or quantities e g orthographic oblique or isometric views sequence drawings exploded views manufacturing sequence e g flow diagrams flow charts 9 1 3 3 Demonstrates knowledge and understanding of safe working practices and efficient use of materials and tools 9 1 4 1 Evaluates the product or system based on self generated objective criteria linked directly to the design brief specifications and constraints using self de
11. held in the hand Fit wire connection s between copper strips CHECKLIST PREPARATION OF THE VEROBOARD SELF PEER DESCRIPTION YES NO YES NO Veroboard finished off Square and exactly 60 mm x 17 mm Complete break in copper strips where applicable with 3 0 mm twist drill held in the hand No greasy fingers prints on board Fit Wire connection s between copper strips fitted correctly ASSESSMENT ACTIVITY Nr 7 19 ASSEMBLE PC BOARD LEVEL CRITERIA 1 2 3 4 components polarities and Some of Most of the ALL polarities fitted correctly lead polarities and polarities and and lead identification lead lead identification not considered identification identification taken into correct correct considerations Component Component Some attempt Component Component leads bend at leads not bend at made to get leads bend at leads bend 90 to the 90 and not to component 90 and to the accurately at 90 correct spacing the correct leads at 90 and correct spacing and to the of veroboard spacing of to the correct of veroboard correct spacing veroboard spacing of of veroboard veroboard Component Component Component Component Component fitted parallelor fitted parallel fitted parallel to fitted parallelor fitted neatly at 90 to a short randomly a long side of at 90 to a short parallel or at 90 side of the board the board side of the board to a short side of
12. inding out things Skills of finding out things are Very basic or lack of skills of X3 finding out things reflected by reflected by reflected by finding Out things are reflected by An ability to critically analyse An ability to analyse situations A basic ability to analyse situations An inability to analyse that situations briefs scenarios etc so briefs scenarios etc so as to briefs scenarios etc and a need to be results in a constant need to be as to identify possible problems identify possible problems needs or prompted about possible problems prompted about possible problems needs or opportunities and articulate opportunities and state findings needs or opportunities needs or opportunities this clearly An ability to access detailed An ability to access information An ability to access information by An inability to access information information by using a range of by using a range of skills like using a some of the skills like by using skills like analysing skills like analysing existing analysing existing products doing analysing existing products doing existing products doing practical products doing practical testing practical testing procedures and practical testing procedures and using testing procedures and using procedures and using suitable using suitable technologies to locate suitable technologies to locate suitable technologies to locate technologies to locate collect collect present and
13. kills of X3 Manufacturing reflected by reflected by by Manufacturing are reflected by Manufacturing accurately in line with the design working drawing Made in accordance with the plan of action that was set out Any deviation is justified Manufacturing in line with the design working drawing Made in accordance with the plan of action that was set out A basic ability to manufacture in line with the design working drawing Made but not always in accordance with a plan of action Manufacturing that reflects little or no correlation to the design working drawing Is made without a plan of action 15 Evaluates x2 Highly developed in the skill of Good skills of evaluating reflected Skills of evaluation are reflected by Very basic or lack of evaluation evaluating reflected by by skills of Reflection are reflected Logical thought out evaluating Well thought out evaluating based A basic ability to evaluate using by based on detailed criteria on criteria criteria sometimes evaluating without Evaluation is not done or is Appropriate testing procedures Appropriate testing procedures criteria inappropriate carried out where necessary carried out where necessary Basic or inappropriate testing No evidence of testing Explanations justifications Adequate explanations procedures procedures 10
14. ly one direction from the anode to the cathode The voltage current characteristics of the LED is similar to that of the ordinary diode LEDs are solid state devices requiring little power and generating little heat Because their heat generation is low and because they do not rely on a deteriorating material to generate light LEDs have long operating lifetimes Anode Cathode Aa F gt 3 aT Aa Fig 3 6 LIGHT EMITTING DIODE 2 7 ALIGHT EMITTING DIODE CIRCUIT Component list 1 Power supply 9 volts battery Led Switch spst R1 2200 ohm resistor R2 10 000 ohm resistor R3 470 000 ohm resistor R4 560 ohm resistor Insulated conductors OO DLA Se tS 11 Led CURRENT LIMITTING RESISTOR _ POWER SOURCE a 9 V BATTERY z SWITCH Fig 3 7 Electric circuit with a LED the resistor limits the current to protect the LED STEPS 1 Connect the plus of the power supply to the Anode of the LED 2 Connect the Cathode of the LED to the one side of R4 560 ohm resistor 3 Connect the other side of R4 560 ohm resistor to the one side of the switch 4 Connect the minus of the power supply the GND to the other side of the switch 5 Turn ON the switch The LED should be ON 6 Now disconnect R4 and replace it with R1 What do you observe 668 7 Now disconnect R1 and replace it with R2 What do you observe 068 8 Now disconnect R2 and replace it with R3 What do y
15. nd 13 2 9 PLASTIC BOX Make own container Figure 3 10 Plastic box 85 x 55 x 30 mm 2 10 SOLDERING Soldering is the process of using a metallic alloy with a relative low melting point to unite conductors in electric circuits in order to ensure good conductivity A good soldering joint must have a e Low resistance and be e Mechanical strong Solder is NOT intended as a kind of glue PREPARING AND SOLDERING OF JOINT PREPARING AND TINNING OF SOLDERING IRON BIT The bit of the soldering iron must be Clean both parts thoroughly and make a cleaned and tinned at all times Using a fine file prepare the working face of the tip to a smooth and shiny surface Heat up soldering iron until tip colour turns brownish Touch resin core not acid core solder on tip and allow a little to melt spread it over the surface quickly by rubbing briskly with a clean dry rag Melt a little more solder on face of tip and rub briskly until the tip has a uniform bright silvery colour The iron is now tinned and ready for use To preserve the tinning the tip should be wiped frequently with a clean rag Overheating will burn away the tinned surfaces mechanical strong joint Do Not use Acid for cleaning Heat up joint by pressing the hot tip of he soldering iron against the clean joint to be soldered When the joint is hot continue to hold the iron in contact with it and touch the tip of a piece of rosin core solder to the joi
16. ndly for boys and girls to use THE ROLE OF THE TEACHER e Provide the electronic equipment e Provide opportunities for developing knowledge and skills when working with electronics INSTRUCTIONS FOR THE LEARNER THE CAPABILITY TASK e Complete the tasks as set out in the module Investigate various electronic devices and circuits Identify various electronic components and their symbols Read the resistance value on a resister Draw circuit diagrams Investigate the influence of different value resisters in a circuit Practice soldering skills Use a soldering iron to join electronic components Use a vero board to build a circuit tester CONTINUITY TESTER Design and make your own innovative creative housing for the electronic device Present a project portfolio that communicates all the technological step followed in designing the housing for the circuit tester e Use suitable communication skills to draw circuit diagrams of the various circuits in the portfolio OR A JOURNAL RUBRIC S MEMO FOR THE ASSESSMENT TASK NAME OF LEARNER TITLE OF THE PROJECT FORM OF ASSESSMENT PROJECT SAASTE Rubric and changes by Alistair Mather TECHNOLOGY ____ KEEPING IT CONNECTED CLASS _9_ LO 1 2 AND 3 DATE LEVELS OF PERFORMANCE CRITERIA Highly effective Most areas are effective Some areas are effective Not effective 5 4 3 2 1 0 Score Investigates Highly developed in the skill of Good skills of f
17. nt If the joint is hot enough the solder will melt and flow like water into all the crevices of the joint and over it Remove the iron and allow the joint to cool before disturbing it ASSESSMENT ACTIVITY NO 3 14 Design a simple object from the given piece 1 metre of copper wire by bending the wire into an interesting shape Your object must contain at least 5 solder joints A few ideas will be given by the educator SOLDERING LEVEL CRITERIA 1 2 3 4 Joints enclosed Joints partly Joints partly Joints entirely Joints entirely in solder enclosed in enclosed in enclosed in enclosed in blobs of solder solder solder but all solder yet the contours of exhibiting all the the junction is contours of the not exhibited junction Bright solder Solder joints are Some solder Most of the Solder joints are joints ALL dull and joints are bright solder joints are ALL bright and uneven and glossy bright and glossy with a glossy with a continuous mirror like mirror like finish finish Solder joints Solder joints full Only some Most of the Solder joints are free from holes of holes pits solder joints are solder joints are ALL free from pits and sharp and sharp free from holes free from holes holes pits and protrusions protrusions pits and sharp pits and sharp sharp protrusions protrusions protrusions Removal of flux No attempt was Some attempt Most of the flux All the flux was made to remove
18. ou observe 005 9 Now disconnect R3 and replace again with R4 10 Turn the switch OFF CURRENT LIMITTING RESISTOR POWER SOURCE 9V BATTERY SWITCH 12 Fig 3 8 Electric circuit with a LED LED connected in reverse mode 11 Disconnect the Anode of the LED from the plus of the power supply 12 Disconnect the Cathode of the LED from the resistor R4 13 Now connect the Cathode of the LED to the plus of the power supply 14 Now connect the Anode of the LED to the resistor R4 15 Turn ON the switch The LED should be OBSERVATION e The LED conducts current when the cathode anode 06 is connected to the voltage e The value ofthe resistor influence the current flow and thus the 0 of the LED 2 8 VEROBOARD Veroboard or stripboard can be used to build useful and interesting projects We are going to use a piece of 60 mm x 17 mm on a 0 1 inch matrix 22 holes by 6 copper connecting strips The components are normally mounted between the strips If your layout requires that a component must be mounted on a strip a break must be introduced into the strip to prevent the component from being short circuited Figure 3 9 When mounting a number of components on a board it is usually necessary to introduce breaks in the strips to prevent undesirable interconnections The breaks in the copper strips where applicable are made with 3 0 mm twist drill held in the ha
19. re Some solder Most of the concave bright glossiness of dull and uneven joints are bright solder joints are and glossy and joint Indication of and glossy bright and show a movement of glossy with a continuous joint while mirror like mirror like cooling finish finish Solder joints Solder joints full Only some Most of the Solder joints are free from holes of holes pits solder joints are solder joints are ALL free from pits and sharp and sharp free from holes free from holes holes pits and protrusions protrusions pits and sharp pits and sharp sharp protrusions protrusions protrusions Removal of flux No attempt was Some attempt Most of the flux All flux made to remove made to remove removed thoroughly the Flux the flux removed 3 2 1 ASSEMBLE THE TESTER e Measure mark and drill all holes e Fit and solder all components take care that the components are fitted correctly as far as polarities and lead identification is concerned 3 2 2 WRITE A USER MANUAL FOR YOUR TESTER The visual outline of the tester indicating all the various terminals and indicators must be included in your user manual PRESENT YOUR PROJECT PORTFOLO AND PRODUCT FOR ASSESSMENT Initial project by Jan Randewijk and adapted by Alistair Mather
20. signed procedures e g surveys questionnaires testing procedures for self testing and suggests sensible improvements or modifications that would clearly result in a more effective or higher quality end product 9 1 5 1 Presents ideas in a project portfolio using formal drawing techniques in two dimensional or three dimensional sketches circuit diagrams or systems diagrams that include all of the following features use of South African conventional drawing standards e g scale outlines dimension lines first and third angle projection notes that clarify design reasoning and key choices impressive enhancements of significant sketches e g colour texture shade thick and thin lines shadow 9 1 5 2 Chooses and uses appropriate technologies to combine and organise graphics and text effectively to produce project portfolios poster presentations case study reports and so on that have a formal organised structure appropriate for the target audience 9 2 3 2 Demonstrates knowledge and understanding of how simple electronic circuits and devices are used to make an output respond to an input signal e g resistors light emitting diodes transistors push or magnetic switches thermistors light dependent resistors 9 3 2 1 Recognises and identifies the impact of technological developments on the quality of people s lives and on the environment in which they live and suggests strategies for reducing any undesirable effects 9 3 3
21. support findings throughout the justifications to support findings Some or no explanations The absence of any explanations process justifications to support findings or justifications Communicates X3 Highly developed in the skill of Good skills of Presentations Skills of Presentations are reflected Very basic or lack of Skills of Presentations reflected by reflected by by Presentations are reflected by An excellent understanding of A good understanding of graphical A basic understanding of graphical Little or no understanding of graphical techniques techniques techniques graphical techniques The use of appropriate method s of The use of acceptable method s of Method s of presentation are not Inappropriate method s used in presentation presentation always appropriate presentation Presentation of work is in a logical Presentation of work is mostly ina Presentation of work is not always Presentation of work is not in any 115 sequence logical sequence in logical sequence logical sequence LO2 Demonstrates an accurate Demonstrates an accurate Demonstrates some understanding of Demonstrate little understanding of Technological 8 understanding of and can apply understanding and can apply and can apply knowledge partially at knowledge at a level lower than the Knowledge and appropriate knowledge accurately at appropriate knowledge accurately at the appropriate level appropriate level Understanding a
22. tivity No 3 solder exercise 11 3 CAPABILITY TASK 12 e Assessment activity No 4 design and drawing 12 e Assessment activity No 5 design a pc board layout 14 e Assessment activity No 6 preparation of veroboard 15 e Assessment activity No 7 assembly of veroboard 16 e Assessment activity No 8 soldering on veroboard 17 3 1 Assemble the tester 18 3 1 Write a user manual for your tester 18 TECHNOLOGY ASSESSMENT TASK 1 OUTCOME You will be able to identify various electronic components and their symbols Read the resistance value on a resister Draw circuit diagrams Investigate the influence of different value resisters in a circuit Use a vero board to build a circuit Use a soldering iron to join electronic components Present a project portfolio which communicates the design process To make a CONTINUITY TESTER Design and make a suitable housing for the circuit tester 6 2 INTRODUCTION TO MATERIALS AND COMPONENTS 2 1 CELLS Convert one type of energy into electrical energy A dry cell batteries converts chemical energy into electrical Energy I AA LREIIIZEL py CIRCUIT SYMBOL PICTORIAL VIEW Figure 3 la Figure 3 1b 2 2 BATTERIES Convert one type of energy into electrical energy A dry cell batteries converts chemical energy into electrical Energy When cells are connected together it is called a battery e CIRCUIT SYMBOL PICTORIAL VIEW Figure 3 2a Figure 3 2b 2 3 RESISTORS THE RESISTOR CO
23. was made to was removed removed the flux remove the flux 15 3 CAPABILITY TASK THE DESIGN SITUATION AS a young person in today s electronic age it is becoming important for people to identify components of electronic devices that are not working in an electronic electrical system During the resent power outages a number of electronic electrical equipment in your house is no longer working A Circuit Tester would be a useful device to have at home to do fault finding on electronic circuits You will be issued with the electronic components to build a circuit for a circuit tester but a housing will be needed for the assembled device to make it functional and user friendly COMPONENT LIST Item Description Quantity Bl 9 Volt battery pp6 with battery clip 1 RI 470 ohm resistors 1 D1 Red Led 5 mm 1 5 volts with mounting rings 1 PC 60 mm x 17 mm Copper clad Veroboard 0 1 matrix 1 TL Tests Lead with Crocodile clips 2 SPECIFICATIONS 1 All the components must be mounted inside a container 2 The test leads must protrude from one of the short sides of the container 3 The board must be exactly 60 mm x 17 mm 22 holes x 6 strips 4 The board must contain at least one wire connection between copper strips 5 The board must have at least one break in a copper strip 6 All the terminating ends must be as close as possible to one of the short sides of the board All components must be laid out square and parallel
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