Electricity

Question 1

Power rating

Answer 1

Energy transferred / time = power

Question 2

Power supplied

Answer 2

Current x p.d. = power supplied

Question 3

Correct fuse

Answer 3

Power / p.d. then add 10%

Question 4

Charge flow

Answer 4

Current x time = charge

Question 5

Where the energy go in a resistor

Answer 5

It converts some of the electric current into heat energy

Question 6

Charge and p.d. ?

Answer 6

1C = 1V

Question 7

Energy supplied to an appliance

Answer 7

P.d. x time x current

Question 8

Useful power

Answer 8

Useful power / total power or unuseful / total power then add to 100

Question 9

Power output

Answer 9

Voltage x current x power factor

Question 10

Earth wire

Answer 10

The wire in the mains that connects the metal casing of an appliance to the earth

Question 11

Fuse

Answer 11

Stops the current flowing by melting a wire if there is too much current going through it

Question 12

Live wire

Answer 12

Wire that has an alternating voltage

Question 13

Neutral wire

Answer 13

The wire that is earthed to the substation so its potential is close to 0

Question 14

Define power

Answer 14

The amount of energy transferred per second