Electricity

Question 1

Voltage

Answer 1

It’s the driving force that pushes the current around

Question 2

Resistance

Answer 2

It’s anything in the circuit that slows the flow down

Question 3

Difference between AC and DC

Answer 3

AC:
Current is constantly changing directions
DC:
Current keeps flowing in one direction

Question 4

Current in a series and parallel circuits

Answer 4

Series:
Current is the same everywhere in the circuit
Parallel:
The current splits so that the current in each individual branch adds up to the power drawn from the power supply

Question 5

Voltage in a series and parallel circuit

Answer 5

Series:
Voltage splits up so that the potential difference across the components adds up to the potential difference of the power supply
Parallel:
It’s the same across each branch

Question 6

What’s the voltage supply in the UK

Answer 6

230 volts

Question 7

What is earthing

Answer 7

1. If the metal case of a component becomes charged then the charges go through the earth wire and to the ground
2. The charge chooses this route as the wire has a low resistance than you
3. Earthing is no use without a fuse or a circuit breaker

Question 8

How do fuses work

Answer 8

1. They cut the circuit when the current exceeds a certain value
2. Thin wire in the ceramic/ glass tube melts due to the temperature and stops the circuit

Question 9

Current

Answer 9

Is the rate of flow of charge round the circuit