Domestic Electricity

Question 1

What is direct current

Answer 1

Constant voltage, always flows in one direction, battery

Question 2

What is alternating current

Answer 2

Voltage changes between positive/negative, changes direction, mains supply

Question 3

National grid

Answer 3

System of cables + transformer that link power stations and consumers

Question 4

Step-up transformers

Answer 4

Increase voltage (potential difference), lowers current

Question 5

Step-down transformers

Answer 5

Decreases voltage (potential difference), higher current

Question 6

What voltage is the earth wire

Answer 6

0v

Question 7

What voltage is the live wire

Answer 7

230v

Question 8

What voltage is the neutral wire

Answer 8

0v

Question 9

What colour is the neutral wire

Answer 9

Blue

Question 10

What colour is the earth wire

Answer 10

Green + yellow

Question 11

What colour is the live wire

Answer 11

Brown

Question 12

Outer insulation:

Answer 12

All wires bundled together with extra plastic insulation

Question 13

Cable grip

Answer 13

Holds tightly so that wires don’t become loose

Question 14

Live wire

Answer 14

Current enters device

Question 15

Fuse

Answer 15

Thin wire that melts if the current gets too high (breaks circuit)

Question 16

Neutral wire

Answer 16

Connects to cable in wall, completes circuit

Question 17

Earth wire

Answer 17

Provides path for current to flow to the ground , safety

Question 18

Where in the plug is the live wire

Answer 18

Bottom right

Question 19

Where in the plug is the neutral wire

Answer 19

Bottom left

Question 20

Where in the plug is the earth wire

Answer 20

Middle