Electricity in home revision

Question 1

Units for power?

Answer 1

Watts

Question 2

Define power?

Answer 2

Energy transferred per second

Question 3

State the equation for power that involves time?

Answer 3

P = E/V

Question 4

State the equation for power that involves current?

Answer 4

P = I x V

Question 5

What type of current do batteries and cells supply?

Answer 5

Direct Current

Question 6

What type of current does mains electricity supply?

Answer 6

Alternating Current

Question 7

What is the frequency of the UK’s mains electricity?

Answer 7

50Hz

Question 8

What is the voltage of the UK’s mains electricity?

Answer 8

230V

Question 9

What is the function of a live wire in a plug?

Answer 9

To carry the voltage

Question 10

What is the function of the neutral wire in a plug?

Answer 10

Completes the circuit

Question 11

What is the function of the earth wire in a plug?

Answer 11

For safety to carry current away in case something goes wrong

Question 12

What is the function of a fuse?

Answer 12

To melt and break the circuit if the current flow is too high.

Question 13

What is the function of a circuit breaker?

Answer 13

Quickly break a circuit if the current is too high.

Question 14

What is the potential difference between the live wire and the neutral wire?

Answer 14

230V

Question 15

What is the potential difference between the earth wire and the neutral wire?

Answer 15

0V

Question 16

Which wire is the fuse always connected to?

Answer 16

Live wire

Question 17

How does the charge move in an a.c

Answer 17

changes direction

Question 18

How does the charge move in a d.c

Answer 18

one direction