# Mains Electricity

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• Created by: Sunset
• Created on: 18-01-14 17:09
Name the three pins in a three-pin plug?
Earth, Neutral and Live
1 of 14
What happens to the fuse if a large amount of electricity flows through the live wire?
It will melt
2 of 14
Why should electricians wear rubber soled boots?
They will not be earthed because rubber has a high resistance so much less current can flow through them
3 of 14
How is electrical power calculated?
Current x Voltage
4 of 14
Give two uses of an LDR (Light Dependent Resistor)?
Security Lights and Digital Cameras.
5 of 14
What does it mean if a resistor is ohmic?
It follows ohms law: the ration of V/I is constant
6 of 14
What is current measured in?
Amps
7 of 14
What is the frequency of A.C. In the Uk mains electricity supply?
50 Hz
8 of 14
What is potential differnce?
Wok done per coulomb of charge
9 of 14
How is charge (Q) calculated?
Current x Time
10 of 14
5 bulbs are in series with a cell of 10V and 7A What is the voltage and current of each bulb.
2V and 7A
11 of 14
How quickly can a RCCB cut off the electricity supply?
40ms
12 of 14
How does a magnetic circuit breaker work?
The electromagnet increases in strength when the current increases. This pulls the iron pivot down, breaking the circuit.
13 of 14
Give one advantage of a RCCB or MCB over a fuse.
They can be reset
14 of 14

## Other cards in this set

### Card 2

#### Front

What happens to the fuse if a large amount of electricity flows through the live wire?

It will melt

### Card 3

#### Front

Why should electricians wear rubber soled boots?

### Card 4

#### Front

How is electrical power calculated?

### Card 5

#### Front

Give two uses of an LDR (Light Dependent Resistor)?