Electricity in the home

Question 1

state the unit for power

Answer 1

watt

Question 2

define power

Answer 2

energy transfered per second

Question 3

state the equation for power that involves time

Answer 3

P = E divided by t

Question 4

equation for power that involves current

Answer 4

P= I x V

Question 5

what current do batteries and cells supply

Answer 5

DC direct current

Question 6

what current does mains electricity supply

Answer 6

AC alternating current

Question 7

how does charge move in A.C

Answer 7

changes direction

Question 8

how does charge move in DC

Answer 8

goes in one direction

Question 9

frequency of uk mains electricity

Answer 9

50 Hz

Question 10

what’s the voltage in a uk home

Answer 10

230 V

Question 11

function of a live wire in a plug

Answer 11

carry the voltage

Question 12

function of neutral wire in a plug

Answer 12

completes the circuit

Question 13

function of the earth wire in a plug

Answer 13

safe way to carry current away if something goes wrong

Question 14

function of a fuse

Answer 14

melt and break the circuit if current is too high

Question 15

function of a circuit breaker

Answer 15

quickly break the circuit if current is too high

Question 16

potential difference between live and neutral wire

Answer 16

230 V

Question 17

potential difference between earth wire and neutral wire

Answer 17

0 V

Question 18

what wire is the fuse always connected to

Answer 18

live wire