P2.5 Mains Electricity

Get Revising

Created by: HamsterGeek
Created on: 15-02-17 12:23

Alternating Current

Electric current in a circuit that repeatedly reverses its direction

1 of 7

Direct Current

Electric current in a circuit that is in one direction only

2 of 7

What is the mains frequency in the UK

50Hz

3 of 7

Why is the live wire dangerous?

Its voltage repeatedly changes from + to - and back every cycle. It reaches over 300V in each direction.

4 of 7

Time base control

An oscilloscope control used to space the waveform out horizontally

5 of 7

What is the voltage of the mains?

230V

6 of 7

Why is the top pin longer in a plug?

The earth pin on a plug is longer than the live and neutral pins. This means the earth pin is the first to connect and the last to disconnect. This means the metal case will be 'earthed' when you plug it in. This stops the metal case becoming 'live'.

7 of 7

Other cards in this set

Card 2

Front

Direct Current

Back

Electric current in a circuit that is in one direction only

Card 3

Front

What is the mains frequency in the UK

Back

Card 4

Front

Why is the live wire dangerous?

Back

Card 5

Front

Time base control

Back

View more cards

Get Revising

P2.5 Mains Electricity