P5 - Electricity In The Home

Question 1

Power

Answer 1

The energy an appliance transfers

Measured in watts

Question 2

Power formula

Answer 2

Energy / time

E / T

Question 3

Power formula (2)

Answer 3

Current x voltage

I x V

Question 4

Energy transformed formula

Answer 4

Charge x voltage

Q x V

Question 5

Direct current (d.c.)

Answer 5

Current which always passes in the same direction, e.g. car batteries, solar cells

Question 6

Alternating current (a.c.)

Answer 6

Current which passes in changing direction, e.g. mains electricity

Frequency = 50 hertz

Voltage = 230 volts

Question 7

Frequency

Answer 7

1 / period

Question 8

Frequency of an a.c. supply

Answer 8

The number of oscillations per second

Question 9

Neutral wire

Answer 9

Blue colour

On the left of the plug

0V

Question 10

Live wire

Answer 10

Brown colour

On the right of the plug

230V

Question 11

Earth wire

Answer 11

Yellow and green colour

In the middle of the plug

0V

Question 12

Outer insulation

Answer 12

Made from plastic

Question 13

Cable grip

Answer 13

This holds the cable tightly in place so that wires do not become loose

Question 14

Fuse

Answer 14

The fuse contains a thin wire that will melt if the current is too high, breaking the circuit and the flow of current, preventing electrocution

Question 15

Earthing

Answer 15

When there is a fault the earth wire takes the current from the live wire and sends it to the ground instead of the person touching it