electricity © pdst home economics. task!!!! make a list of all electrical appliances you have in...
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Electricity
© PDST Home Economics
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TASK!!!!
Make a list of all electrical appliances
you have in your home
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Electricity Sources
• Electricity is generated at power stations from
1. Coal
2. Oil
3. Peat
4. Water
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• Electric metre records the amount of electricity used in units
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• Second metre in some homes which use off peak Nightsaver Electricity
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Cables pass from consumer unit bringing power to each room
Consumer Unit
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• Flexes of appliances have at least 2 wires or cores
1. Live Wire : (Brown) Bringing electricity TO the appliance2. Neutral Wire: (Blue) Taking the return current
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• Any appliance with only 2 wires must be doubly insulated and carry the symbol shown
• Most appliances have 3rd Wire called Earth Wire (Green/yellow) – brings current safely to the earth if a fault occurs and not through the person using the appliance
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Lively Brown Bear
Jumped on earthy green grass
Under a neutral blue sky
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Possible Faults
• Overloading a circuit by using too many appliances/overloading adaptor
• Short Circuit – a live and neutral wire touching in wiring/ incorrectly wired plug
• Overheating – due to faulty thermostat
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Fuse
• Safety device
• Deliberate weak link in wiring system
• Melts when fault occurs
• Disconnects Electricity and so prevents a fire
• Found in 3 pin plug and fuse box
• Modern fuse boxes use circuit breakers
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HOMEWORK
1. State the name, colour and function of the three wires in a plug
2. What is the purpose of a fuse?
3. Compose five safety rules to follow when using
electricity in the home?