electricity-p5

Question 1

what is current measured in

Answer 1

amperes

Question 2

what is potential difference measured in

Answer 2

voltage

Question 3

what is resistance measured in

Answer 3

ohms

Question 4

what the equation for volt, amps and resistance

Answer 4

p.d = current x resistance
V=IR

Question 5

what’s the equation of charge

Answer 5

charge= current x time

Question 6

what’s the unit of charge

Answer 6

coloumbs, c

Question 7

what’s the equation for power

Answer 7

power= current x potential difference

or

power = energy/time

Question 8

what are step up transformers used for

Answer 8

to increase the p.d and decrease current

Question 9

what’s the step down transformer used for

Answer 9

to decrease the potential difference and increase the current

Question 10

what current reverses in direction

Answer 10

alternating current

Question 11

what current moves in one direction

Answer 11

direct current

Question 12

what is the direct current supplied by

Answer 12

the cells and batteries

Question 13

what’s the alternating current supplied by

Answer 13

the mains supply

Question 14

what voltage and hertz is the mains supply

Answer 14

230v and 50hz

Question 15

what three wires are present in uk plugs

Answer 15

live wire, earth wire and neutral wire

Question 16

what are the wires coated in

Answer 16

plastic

Question 17

what colour is the earth wire

Answer 17

yellow and green

Question 18

what colour is the live wire

Answer 18

brown

Question 19

what colour is the neutral wire

Answer 19

blue

Question 20

what the voltage of neutral wire

Answer 20

0v

Question 21

what the voltage of live wire

Answer 21

230v

Question 22

what the voltage of earth wire

Answer 22

0v

Question 23

what is power measured in

Answer 23

watts, w

Question 24

what’s energy measured in

Answer 24

joules,j

Question 25

what’s time measure in

Answer 25

seconds,s

Question 26

what’s the fuse connected to

Answer 26

the live wire

Question 27

what happens if the current gets too hot

Answer 27

fuse wire heats up, melts and breaks

Question 28

what the national grid

Answer 28

a network of cables and transformers

Question 29

what are the pins in a plug made out of and why

Answer 29

brass so it doesn’t rust

Question 30

what’s are the plugs made out of and why

Answer 30

stiff plastic because their good insulators

Question 31

how do u get 1000 miliamps into 1 amp

Answer 31

divide by 1000

Question 32

how do u get 1amp into 1000miliamps

Answer 32

times by 1000

Question 33

what the equation for energy

Answer 33

energy = power x time

or

energy = current x time x p.d

Question 34

what’s the equation for energy in kilowatt hours

Answer 34

energy(kwh) = power(kw) x time(h)

Question 35

what’s efficiency’s equation

Answer 35

efficiency = useful output/ total input x 100

Question 36

how do you get from 1000watt to 1kilowatt

Answer 36

divide by 1000

Question 37

how do u get from 1 kilowatt to 1000 watt

Answer 37

times by 1000

Question 38

what the equation for potential difference

Answer 38

p.d = energy/charge

or

p.d = current x resistance