Electricity and National Grid

Function of earth wire- yellow/green?

Prevents danger from short circuits

Function of fuse?

Melts if current gets too high

Function of neutral wire-blue?

Carries current away from plug

Function of live wire- brown?

Carries current to plug

Function of cable grip?

Prevents a loose wire if cable is pulled

Function of double insulated cables?

Prevents electric shock

What is alternating current (AC)?

Current which changes direction 50 times a second- found in mains

What is direct current (DC)?

Current that only travels in one direction- found in batteries

Function of step up transformer?

Increases voltage of the AC

Function of high voltage transmission cables?

High voltage reduces energy loss

Function of step down transformer?

Decreases the voltage of the AC