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Activity 1
To
| LO 1.3 | LO 2.1 | LO 2.4 | ||||||||||||||
In a system each part has a function to fulfill in order to make the system work. Electrical systems are no different. Each part, in this case called the component, has a specific function. The components cannot function separately and must be linked to one another in what we call a circuit .
A circuit must have a power source, e.g. a battery, it must be closed and it must have a function, e.g. a light bulb that emits light. You will be working with very simple systems in this module.
Certain materials are suitable to conduct electricity well and are used in circuits. They are known as conductors. Examples of conductors are silver, copper, aluminium and gold. You entrust your life to isolators every day, for example when you touch the electrical cord of a hair-drier. Isolators are materials that do not conduct electricity, because they do not contain any free electrons. Examples are rubber, PVC and asbestos.
Assignment1:
| Item | Material | Isolator | Conductor |
| Ruler | |||
| Nail | |||
| Paper clip | |||
| Wool | |||
| Cardboard | |||
| Tin foil |
If you open a radio, you will see a lot of coloured components on green boards. These advanced circuits and the lay-out are designed with the aid of a computer. Before the construction of a circuit can be started, a circuit diagram has to be drawn to indicate the exact lay-out. We are going to examine only a few basic components that will enable us to design and manufacture a simple circuit for an article. We classify the components according to their function in three categories, namely Input , Process and Output .
| Input | Process | Output | ||
| Push-button switch | Resistor | Light bulb | ||
| Cell |
| Battery |
| LED * |
| Buzzer |
*LED stands for “Light Emitting Diode”, thus a diode that emits light. A diode is a little apparatus that allows current to flow in one direction only, therefore it can only be coupled in one way in the circuit.
Assignment 2
1. Draw a simple circuit that contains the following components:
BATTERY, SLIDING SWITCH, LIGHT BULB, CONDUCTOR
2. Provide two examples of each where the heating effect, magnetizing effect and chemical effect of an electrical current are applied.
| LO 1.3 | LO 2.4 | LO 2.1 | ||||||||||||||
| Learning outcomes(LOs) |
| LO 1 |
| TECHNOLOGICAL PROCESSES AND SKILLS The learner will be able to apply technological processes and skills ethically and responsibly using appropriate information and communication technology. |
| Assessment standards(ASs) |
| This is demonstrated when the learner: |
| investigates:1.1 investigates the background context, the nature of the need, the environmental situation, and the people concerned when given a problem, need or opportunity set in a nationally relevant context; |
1.2 compares existing products relevant to the problem situation based on:
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| 1.3 develops and performs practical tests in the technological knowledge areas (structures, processing and systems and control); |
1.4 uses appropriate technologies and methods to:
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| designs:1.5 writes or communicates a short and clear statement or a design brief in response to a given identified situation for the development of a product or system; |
1.6 lists product and design specifications and constraints for a solution to an identified or given problem, need or opportunity based on most of the design key words listed below:
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| 1.7 generates several alternative solutions and writes notes, ideas that show links to the design brief, specifications and constraints; |
| 1.8 chooses possible solutions based on well-reasoned argument and develops the chosen idea to include more specific details using graphic and / or modelling techniques; |
makes:1.9 develops a plan for making that includes all of the following:
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| 1.10 chooses and uses appropriate tools and materials to make products by measuring, marking, cutting or separating, shaping or forming, joining or combining, and finishing different materials accurately using appropriate techniques; |
| 1.12 uses safe working practices and shows awareness of efficient ways of using materials and tools; |
| evaluates:1.13 tests and evaluates the products or systems with objectivity, based on objective criteria linked to the design brief, specifications and constraints, and suggests sensible improvements or modifications; |
communicates:1.14 presents ideas (in a project portfolio) using two-dimensional or three-dimensional sketches, circuit diagrams or systems diagrams that include all of the following:
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| Learning outcomes(LOs) |
| LO 2 |
| TECHNOLOGICAL KNOWLEDGE AND UNDERSTANDING The learner will be able to understand and apply relevant technological knowledge ethically and responsibly. |
| This is demonstrated when the learner: |
structures:2.1 demonstrate knowledge and understanding of frame structures:
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Assignment 1
| Item | Material | Isolator | Conductor |
| Ruler | Perspex | Yes | No |
| Nail | Steel | No | Yes |
| Paper Clip | Copper | No | Yes |
| Wool | - | Yes | No |
| Cardboard | - | Yes | No |
| Tin foil | Aluminium | No | Yes |
Assignment 2 CIRCUITS
2.
Heating: heater, hot water cylinderMagnetic: electric motor, domestic doorbell, indicator lights of a car, Chemical: swimming pool chlorinator, covering objects in metal/electrode
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