electricity yr 9

Question 1

what is current measured in?

Answer 1

amps

Question 2

what is p.d. measured in?

Answer 2

Volts

Question 3

what colour is the earth wire?

Answer 3

blue

Question 4

what does ‘I’ mean in the equation P = IV

Answer 4

current

Question 5

what does L.E.D stand for?

Answer 5

Light Emitting Diode

Question 6

if there are 2 resistors in parallel, one with a resistance of 12 Ω the other as 3 Ω, what is the combined resistance of the circuit?

Answer 6

4 Ω

Question 7

what does L.D.R stand for?

Answer 7

light dependant resistor

Question 8

Is the p.d. shared or not shared in a series circuit?

Answer 8

shared

Question 9

what colour is the neutral wire?

Answer 9

green/yellow

Question 10

what does ‘t’ mean in the equation Q = I x t?

Answer 10

time

Question 11

what does a thermistor measure?

Answer 11

temperature

Question 12

what does ‘R’ mean in the equation P = I² R

Answer 12

resistance

Question 13

what colour is the live wire?

Answer 13

brown

Question 14

what is the average frequency of the live wire?

Answer 14

50Hz

Question 15

what is the average p.d. of the earth wire?

Answer 15

0V

Question 16

what is the average voltage of the UK?

Answer 16

230V

Question 17

what does ‘P’ mean in the equation P = IV

Answer 17

power

Question 18

what is the current?

Answer 18

flow of electrons

Question 19

what does ‘Q’ mean in the equation E = VQ and give the units

Answer 19

charge, coulombs

Question 20

what is resistance measured in?

Answer 20

Ohms

Question 21

what does L.D.R stand for?

Answer 21

Light Dependant Resistor

Question 22

what does ‘V’ mean in the equation P = IV

Answer 22

potential difference

Question 23

what does ‘P’ mean in the equation P = IV and give the units

Answer 23

power, watts