Mains Electricity2

Question 1

What does AC and DC mean?

Answer 1

Alternating Current
Direct Current

Question 2

Is main electricity AC or DC?

Answer 2

AC

Question 3

State the frequency of UK mains electricity

Answer 3

50 Hz

Question 4

State the potential difference of UK mains electricity

Answer 4

230 V

Question 5

What are the names of the 3 wires in 3-pin UK plug?

Answer 5

Live
Neutral
Earth

Question 6

What colour is the Live wire in a 3-pin UK plug?

Answer 6

Brown

Question 7

What colour is the neutral wire in a 3-pin UK plug?

Answer 7

Blue

Question 8

What colour is the earth wire in a 3-pin UK plug?

Answer 8

Striped yellow and green

Question 9

State the function of the live wire

Answer 9

Carries alternating potential difference from the supply

Question 10

State the function of the neutral wire

Answer 10

Completes the circuit and carries away the current

Question 11

State the function of the earth wire

Answer 11

Safety wire: To avoid an electrical shock from a metal casing becoming charged

Question 12

What is the voltage in the live wire?

Answer 12

230 V

Question 13

What is the voltage in the neutral wire?

Answer 13

0 V

Question 14

State two things that affect the amount of energy an appliance transfer.

Answer 14

Power and time

Question 15

State the equation which links energy, power and time

Answer 15

E = P x T

Question 16

State the equation we use to calculate the energy transferred by a device using the potential difference and charge flow.

Answer 16

E = Q x V

Question 17

State the equation that relates electrical power, potential difference and current

Answer 17

P = V x I