p2

Question 1

revise component symbols

Answer 1

in ‘new physics booklet’ or online

Question 2

what is current?

Answer 2

• the flow of charge

Question 3

what piece of equipment do you use to measure current?

Answer 3

• ammeter

Question 4

what are the units of current?

Answer 4

• amps (A)

Question 5

what is voltage?

Answer 5

• the push around a circuit

Question 6

what piece of equipment do you use to measure voltage?

Answer 6

• voltmeter

Question 7

what are the units of voltage?

Answer 7

• volts (V)

Question 8

what happens when there is low resistance?

Answer 8

• more current

Question 9

what happens when there is high resistance?

Answer 9

• low current

Question 10

what are the units of resistance?

Answer 10

• ohms

Question 11

what is charge?

Answer 11

• rate of the flow of current

Question 12

what is the units of charge?

Answer 12

coulombs (C)

Question 13

revise I-V graphs (diode, bulb and resistor)

Answer 13

in ‘new physics booklet’ or online

Question 14

what is the national grid?

Answer 14

• a network of power stations, power lines, and electricity infrastructure that distributes electricity across the country.

Question 15

what is a step-up transformer?

Answer 15

• they are used to increase or ‘step up’ voltages

Question 16

what is a step-down transformer?

Answer 16

• used to decrease or ‘step down’ voltages

Question 17

what happens in an LDR?

Answer 17

• as light increases, the resistance decreases.

Question 18

what happens in a thermistor?

Answer 18

• as temperature increases, the resistance decreases.

Question 19

what is a parallel circuit?

Answer 19

• components are connected across each other, forming multiple branches.

Question 19

what is a series circuit?

Answer 19

• components are connected end-to-end, forming a single path

Question 19

in a series circuit, what happens to the current?

Answer 19

• stays the same

Question 20

in a series circuit, what happens to the voltage?

Answer 20

• it splits

Question 21

in a series circuit, what happens to the resistance?

Answer 21

• it increases

Question 22

in a parallel circuit, what happens to the current?

Answer 22

• it splits (different)

Question 23

in a parallel circuit, what happens to the voltage?

Answer 23

• stays the same

Question 24

in a parallel circuit, what happens to the resistance?

Answer 24

• the total resistance is less than the smallest resistance (decreases)

Question 25

what is meant by AC supply?

Answer 25

• alternating current
• potential difference and current change direction

Question 26

what is meant by DC supply?

Answer 26

• direct current
• potential difference and current stays in the same direction

Question 27

what supply do batteries use?

Answer 27

DC

Question 28

what supply does mains electricity use?

Answer 28

AC

Question 29

why do metal casing objects have an Earth wire?

Answer 29

• it protects you from getting an electric shock.
• the live wire comes into contact with the casing, which makes it live.
• the Earth wire will take it back to Earth.

Question 30

what is the voltage and frequency of mains electricity?

Answer 30

• 230 v
• 50 Hz

Question 31

describe the wires in a plug

Answer 31

live wire = brown
neutral wire = blue
earth wire = yellow and green

Question 32

how is electricity transported across the UK?

Answer 32

• the national grid