What units are used to measure the total energy transferred by an electrical appliance?
1. Joules (J)
2. Kilojoules (kJ)
3. Kilowatt-hours (kWh)
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What is the definition of power in the context of electrical appliances and what units is power measured in?
Power is the rate at which an electrical appliance transfers energy, and is measured in Watts (W) or Kilowatts (kW).
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What is the formula to calculate energy transferred using power in Watts and time in seconds?
Energy transferred (J) = power (W) × time (s)
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What is the formula to calculate energy transferred using power in Kilowatts and time in hours?
Energy transferred (kWh) = power (kW) × time (h)
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How can electricity meters be used to calculate energy usage over a specific period?
To calculate energy usage using an electricity meter:
1. Take meter readings at the start and end of the desired period.
2. Subtract the start reading from the end reading.
3. The result is the energy used in kilowatt-hours (kWh) during that period.
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What is the formula to calculate the cost of an electricity bill?
Cost = Energy transferred (kWh) × Price per kWh, where the price per kWh depends on your tariff, typically ranging from 20-45 pence per kWh.
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