Domestic uses and safety: แบบฝึกหัด

Inside a standard UK three-core cable, what is the color of the insulation covering the neutral wire?

What are the typical values for the frequency and potential difference of the UK domestic mains electricity supply?

An electric heater with a resistance of \(46\text{ }\Omega\) is connected to the UK mains supply (\(230\text{ V}\)). Calculate the power of the heater.

A toaster is connected to the UK mains supply. What is the approximate potential difference between the live wire and the earth wire?

A microwave oven uses the UK mains supply (\(230\text{ V}\)). If the current through the device is \(4\text{ A}\), calculate the power of the microwave.

State the insulation color for the live, neutral, and earth wires used in a standard UK three-core cable.

Explain how the earth wire and a fuse work together to protect a user if a fault causes the metal case of an appliance to become live.