electricity

Question 1

state the 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 current

Answer 3

p = e ➗t

Question 4

state the equation for power that involves current

Answer 4

p = l x v

Question 5

what type of current do batteries and cells supply?

Answer 5

DC direct current

Question 6

what type of current does mains electricity supply?

Answer 6

AC alternating current

Question 7

how does the charge move in AC?

Answer 7

it changes

Question 8

how does the charge move in dc?

Answer 8

in one direction

Question 9

what is the frequency of uk mains electricity?

Answer 9

50hz

Question 10

what is the voltage of uk mains electricity?

Answer 10

230 v

Question 11

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

Answer 11

to carry the voltage

Question 12

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

Answer 12

it completes the circuit

Question 13

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

Answer 13

for safety to carry current away if something goes wrong

Question 14

what is the function of a fuse?

Answer 14

to melt and break the circuit if the current is too high

Question 15

what is the difference between the live wire and the neutral wire?

Answer 15

230 v

Question 16

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

Answer 16

0 v