electricity in the home

Question 1

what is the frequency of mains electricity in the yk

Answer 1

50 Hz

Question 2

what is the voltage of mails electricity in the yk

Answer 2

230V

Question 3

what colour is the live wire

Answer 3

brown

Question 4

what colour is the neutral wire

Answer 4

blue

Question 5

what colour is the earth wite

Answer 5

green and yellow stripes

Question 6

what does the live wire do

Answer 6

carries alternating potential difference from the supply

Question 7

what does the neutral wire do

Answer 7

completed the circuit

Question 8

what does the earth wire do

Answer 8

safety wite to stop alliance becoming live

Question 9

what is the potential fifference between the earth wire and the love wire

Answer 9

230 V

Question 10

what is the potential difference pf earth wire

Answer 10

0

Question 11

what is the potential difference of the neutral wire

Answer 11

0

Question 12

when does the live wire carry the current

Answer 12

when there is a fault

Question 13

what is the equation that links current, power and resistance

Answer 13

power= potential difference x current

Question 14

what is the equation thag links current power and resistance

Answer 14

power=(current)squared x resistance

Question 15

what is the symbol for power

Answer 15

P

Question 16

what is the unit for power

Answer 16

Watts W

Question 17

what is the symbol for potential difference

Answer 17

V

Question 18

what is the unit for potential difference

Answer 18

Volts V

Question 19

what is the sumbol for current

Answer 19

I

Question 20

what is the unit for current

Answer 20

Amperes, A

Question 21

what is the symbol for resistance

Answer 21

R

Question 22

what is the unit for resistance

Answer 22

Ohms

Question 23

whay does the amount of energy an appliance transfers depend on

Answer 23

the power of the appliance and how long it is switched on for

Question 24

when is work done in a circuit

Answer 24

when charge flows

Question 25

what is the equation that links energy transferred, power and time

Answer 25

energy= power transferred x time

Question 26

what is the equation that links charge flow, energy transferred and potential difference

Answer 26

energy transferred= charge flow x potential difference

Question 27

what is the unit for energy transferred

Answer 27

Joules J

Question 28

what is the unit for time

Answer 28

seconds S

Question 29

what is the unit for charge flow

Answer 29

coloumbs C

Question 30

what is the national grid

Answer 30

a system of cables and transformers linking powrt stations to consumers

Question 31

what do step up transformers do

Answer 31

increase the potential difference from the power station to transmission cables

Question 32

what do step down transformers do

Answer 32

decrease the potential diffefence for domestic use