Mains electricity

What is it meant by direct current and alternating current?

What do we mean by the peak voltage of an alternating potential difference?

What do we mean by the live wire and the neutral wire of a mains circuit?

How do we use an oscilloscope to measure the frequency of an alternating current?

What is the casing of a mains plug or socket made from and why?

What is in a mains cable?

What colour are the lives, neutral and earth wires?

Why does a 3-pin plug include an earth pin?

Why is a fuse always on the 'live' side of an appliance?

What is a circuit breaker?

Why are appliances with plastic cases not earthed?

What is the relationship between power and energy?

How can we calculate electrical power and what is its unit?

How can we calculate the current for a fuse?

What is an electrical current?

How do you calculate charge from current and time?

What can we say about the electrical energy supplied by the battery in a circuit and the electrical transferred to the components?

Why are electrical faults dangerous?

How can we prevent electrical faults?

When choosing an electrical appliance, what factors in addition to cost should be considered?