GCSE Physics - Fuses and Earthing #23

The video discusses electrical surges, their causes, and potential dangers such as fires and electric shocks. It explains safety measures like fuses, circuit breakers, earthing, and double insulation. Fuses are simple and cheap but need replacement after a surge, while circuit breakers can be reset. Earthing provides a safe path for excess current, and double insulation prevents electric shocks by covering appliances in non-conductive material.

What is a common cause of electrical surges?

• Using a battery-powered device

• Turning an appliance on or off

• A decrease in voltage

• A steady current flow

How does a fuse protect an electrical circuit?

• By melting and breaking the circuit

• By increasing the voltage

• By cooling down the wires

• By storing excess current

What is a key advantage of circuit breakers over fuses?

• They are cheaper

• They can be reset after a surge

• They conduct electricity better

• They are smaller in size

What is the purpose of an earth wire in an appliance?

• To reduce the appliance's weight

• To provide an alternative path for current

• To increase the appliance's power

• To enhance the appliance's speed

Why might an appliance with double insulation not need an earth wire?

• It is made of metal

• It has no exposed metal parts

• It uses less electricity

• It is more expensive