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Note that your final mark will not be saved in the system.
Power supplies GapFill
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4-5
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Domestic electrical appliances use mains electricity. This has an alternating potential difference with a value of
, at a frequency of
.
Mains electricity is delivered by three-core cables, which consist of the wire, which provides the potential difference, the wire, which completes the circuit, and the wire, which is for safety purposes and only carries a current if there is a fault in the appliance.
Circuits transfer power at a rate equal to P = VI, or . The total energy transferred by a component is equal to .
Mains electricity is delivered by the National Grid, which connects power stations to homes and businesses. At power stations, the potential difference of the electricity is increased using for transmission, and in homes the potential difference is decreased using for use by appliances.
Mains electricity is delivered by three-core cables, which consist of the wire, which provides the potential difference, the wire, which completes the circuit, and the wire, which is for safety purposes and only carries a current if there is a fault in the appliance.
Circuits transfer power at a rate equal to P = VI, or . The total energy transferred by a component is equal to .
Mains electricity is delivered by the National Grid, which connects power stations to homes and businesses. At power stations, the potential difference of the electricity is increased using for transmission, and in homes the potential difference is decreased using for use by appliances.