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Electrical power is measured in watts (W).
1 watt is equal to 1 joule per second.
The typical power rating of an electric kettle is about 2000 W.
Electrical energy can be transferred from chemical stores in a battery to internal energy in a component.
The equation for electrical power is P=IV.
To calculate the energy transferred by a device, use the equation E=IVt.
The power rating of an appliance does not affect the amount of energy it transfers.
The unit for electrical energy is the joule (J).
1 kilowatt-hour (kWh) is equivalent to 3600 joules (J).
Domestic electricity meters measure energy in kilowatt-hours (kWh).
The cost of electricity usage can be calculated using the equation: cost = energy in kWh × cost per kWh.
An appliance with a power rating of 100 W used for 1 hour consumes 0.1 kWh of energy.
The electrical energy transferred by a 12 V heater with a current of 0.50 A over 5 minutes is 150 J.
The equation E=IVt calculates power transferred over time.
Using joules as a measure of energy for domestic electricity usage is practical and convenient.