(b) mains electricity

use of insulation to protect the device or user in domestic appliances (2.2)

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use of double insulation to protect the device or user in domestic appliances (2.2)

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use of earthing to protect the device or user in domestic appliances (2.2)

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use of fuses to protect the device or user in domestic appliances (2.2)

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use of circuit breakers to protect the device or user in domestic appliances (2.2)

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currents in resistors (2.3)

understand why a current in a resistor results in the electrical transfer of energy and an increase in temperature, and how this can be used in a variety of domestic contexts

relationship between power, current and voltage (2.4)

power = current × voltage

P = I × V

relationship between energy transferred, current, voltage and time

energy transferred = current × voltage × time

E = I × V × t

alternating current

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direct current

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