Electricity

Question 1

How do power stations work

Answer 1

Generating lots of electricity and converting thermal energy into electrical energy

Question 2

How to create a lot of heat

Answer 2

Low current
High voltage because of resistance

Question 3

Use of step up transformer

Answer 3

Increase voltage
= minimise energy loss during transmission

Question 4

Use of step down transformers

Answer 4

Decrease voltage
= high voltage is dangerous and it would blow up house hold appliances

Question 5

Define static electricity

Answer 5

Build up of charge on insulating materials

Question 6

Describe static electricity on insulating materials eg a cloth

Answer 6

Electrons can’t flow
= positive static charge

Question 7

Describe what happens when size of charge increases

Answer 7

• potential difference increases
  If potential difference is large enough electrons can jump across the gap to earth= a spark

Question 8

Use of copper

Answer 8

Conduct electricity

Question 9

Describe the live wire

Answer 9

Brown
Provides alternating potential difference of 230V

Question 10

Describe the neutral wire

Answer 10

Blue
Complete the circuit by carrying away current

Question 11

Describe the earth wire

Answer 11

Striped green and yellow
Doesn’t normally carry a current
Stops appliance casing from becoming live (would get electric shock otherwise)

Question 12

Why do earths and neutral wire pass electricity

Answer 12

Both have 0 voltage