P2

Question 1

What is charge

Answer 1

The value of electricity flowing in a circuit

Question 2

What is current

Answer 2

The flow of electrons

Question 3

What is potential difference

Answer 3

Potential difference pushes current around

Question 4

What is resistance

Answer 4

Resistant slows down the current

Question 5

Thermistor uses

LDRS uses

Answer 5

Central heating

Street lights, security lights

Question 6

Mains electricity in the UK

Answer 6

230 V

50 HZ

Question 7

Different wires in a plug

Answer 7

Livewire (brown)
- provides potential difference

Earth wire( yellow/green)
- stops appliance becoming live 

Neutral wire (blue)
- carries current away

Question 8

Fuse purpose in a plug

Answer 8

The fuse melts if too much current goes through, acts as a safety feature

Question 9

Cable grip function in a plug

Answer 9

Holds the wires in place

Question 10

The National Grid structure

Answer 10

1) power station

2) step up transformer
- low voltage > high voltage so energy can move efficiently

3) step down transformer
- high voltage > low voltage so it’s safe to be in homes

4) houses