| Unit V: ELECTRICITY |
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Specific Objectives
Students should be able to: |
Explanatory notes
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Suggested Practical Activities
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1. Discuss the use of good and poor conductors of electricity;
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Definition of conductors (good and poor). Use of rubber and plastics in covering electric wires and connections.
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Simple experiments to detect good and poor conductors.
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2. Explain the relationship between voltage, current and resistance in circuits;
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Use of formula V=IR to find unknown units of electricity: ampere, volt, watt, and ohm; mention symbols for ammeter,
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Calculate wattage given voltage and current;
use ammeters and voltmeters to show how different resistance affect current;
set up circuits to show properties;
draw diagrams of series and parallel circuits.
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3. Explain how a fuse works as a safety device;
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Color code in wiring plug and choice of flex;
dangers of overloading circuit (overheating of wire that may cause insulation to burn).
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Wiring of a plug.
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4. Calculate the amperage for fuses and flexes needed for household appliances;
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Use of formula I=W/V (watts divided by volts); consider use of thick wires as overhead cables and for heavy-duty appliances. Energy consumption = power x time. |
Work out size of fuses for appliances.
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5. Calculate the energy consumption of different electrical appliances;
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The cost of using heating appliances (cloth iron, stoves) and non heating appliances ( radio, fluorescent bulbs, fans)
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Measure energy consumption (units on meter) of different appliances.
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| 6. Calculate electricity bills; |
Various costs which must be considered when making up electricity bills, including meter rentals and fuel adjustment charges; Unit-1kwh. |
Read both digital and analogue meters.
If possible document electric supply from sources by switching off.
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| 7. Describe the methods of extinguishing an electrical fire; |
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Use non-electric fire extinguisher (Co2) or non-flammable material to smother fire. |
| 8. Discuss energy conservation measures that can be taken in the use of electrical household appliances; |
Relationship between frequent and lengthy opening of refrigerator doors and increased consumption; energy wastage in faulty electrical appliances. |
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| 9. Discuss what energy transformation must take place to produce electricity; |
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Make bells, bi-relays and electromagnets; demonstrate magnetic effect. |
| 10. Discuss the magnetic effects of electrical current. |
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| Go to Section B: Unit VI: FOSSIL FUELS/SOLAR ENERGY/ALTERNATIVE SOURCES |
Integrated sci yes,
but what about us who are doing Human and Social biology? An exam guide would be nice for us too.