Physics- P5: Electricity in the home

AC

Alternating current

DC

Direct current

What is the difference between alternating and direct current?

Direct current electrons only flow in one direction, in alternating current the electrons change directions and vibrate

What is the frequency of UK mains?

50Hz

What is voltage of UK mains?

230V

What is the national grid?

The National Grid is a network high-voltage power systems connecting major power stations

Why is the national grid an efficient way to transfer energy?

The potential difference is very large so much less current is needed

What are the three wires in a plug?

\-Earth wire, live wire and neutral wire,

What is the purpose of the fuse?

It stops too much energy going through, if there is too much energy it will overheat and melt to prevent fires.

What is the purpose of the earth wire?

Prevents electrocution

Why is the live wire dangerous even if the appliance is switched off?

Peoples bodies are at 0V so if a live wire is touched there is a big potential difference that will act across their body causing an electric shock

How do you determine the correct fuse for an applicance?

\-Current= power/voltage

\-Decide whether to use a 3A, 5A of 13A fuse