Domestic Electricity

Question 1

Define alternate current

Answer 1

Comes from the mains electricity at an average of 230V

Question 2

Define direct current

Answer 2

Comes from a battery at 1.5V

Question 3

What colour is the earth wire

Answer 3

Green and yellow

Question 4

What colour is the live wire

Answer 4

Brown

Question 5

What colour is the neutral wire

Answer 5

Blue

Question 6

Which side is the neutral wire

Answer 6

Left

Question 7

What side is the live wire

Answer 7

Right

Question 8

What material are the pins made of in a plug

Answer 8

Brass because it doesn’t rust and is a good conductor

Question 9

What material is the casing of a plug made of

Answer 9

Plastic - a good insulator of electricity

Question 10

What does the casing around a plug prevent

Answer 10

The wires from touching

Question 11

What type of current does the live wire carry

Answer 11

Alternating current

Question 12

What does the neutral wire do

Answer 12

Completes the circuit so its kept at 0V

Question 13

What does the earth wire do

Answer 13

Safety wire safer to touch device if there is a fault

Question 14

When does a fuse blow

Answer 14

When the current is too high

Question 15

What is a short circuit

Answer 15

When current flows along an easy path without passing through the appliance. There’s little resistance in this part so it overheats and fires

Question 16

A fuse has what built in weak point

Answer 16

A qire with a high resistance

Question 17

What is a circuit breaker

Answer 17

When there is too much current the electromagnet opens the switch and stops the current

Question 18

Define power

Answer 18

The rate that energy is transferrent

Question 19

Whats the way to remember equations

Answer 19

EVie QuITs smoking so she Pees on the IV with her PET because she got a VIRus

Question 20

Ehat voltage is produced by power stations

Answer 20

25,000

Question 21

What voltage is sent through the national grid

Answer 21

132,000 - 400,009

Question 22

What voltage arrives at our homes

Answer 22

230V

Question 23

Define national grid

Answer 23

A nationwide network of cables and transformers that transforms electricity from power stations to consumers

Question 24

What remains constant is transformers?

Answer 24

Power does as is P.D. increases the current decreases

Question 25

Define transformer

Answer 25

A transformer is two coils of wire wrapped around an iron core they can step up or step down the voltage to be suitable for a lication

Question 26

Whay does the voltage increase through the national grid

Answer 26

To decrease the current and reduce energy loss

Question 27

What is a step up transformer

Answer 27

More turns on the secondary coil so it increases voltage

Question 28

What is a step down transforemer

Answer 28

Fewer turns on the secondary coil to reduce the voltage

Question 29

Equation with p,r,I squared

Answer 29

P = I**2 x R