Domestic Electricity

Question 1

What are the main wires?

Answer 1

Live
Neutral
Earth

Question 2

What are 5A, 15A and 30A used for?

Answer 2

5A- lighting
15A- heater
30A- cooler

Question 3

What colours are the wires?

Answer 3

Brown- live
Blue- neutral
Yellow- Earth

Question 4

Which wire is the fuse on?

Answer 4

Live

Question 5

How does a fuse work?

Answer 5

Melts when the current gets too high

Question 6

What is the difference between a one way and two way switch?

Answer 6

One way is either off or on.
A two way switch provides two paths for the current to flow

Question 7

What is the formula for power?

Answer 7

P= VI
Power = voltage x current

Question 8

What does 2 square symbol mean?

Answer 8

Double insulation- all the metal parts are surrounded by an insulating plastic

Question 9

What is the second formula for power?

Answer 9

Power = energy transferred/time
E = PT

Question 10

What is the formula for units of energy?

Answer 10

Units of energy (kWh) = Power x time.

Question 11

What is the formula for cost?

Answer 11

Cost = number of units x price of 1 unit