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physics paper 1 > p2 > Flashcards

p2 Flashcards

1
Q

revise component symbols

A

in ‘new physics booklet’ or online

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2
Q

what is current?

A
  • the flow of charge
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3
Q

what piece of equipment do you use to measure current?

A
  • ammeter
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4
Q

what are the units of current?

A
  • amps (A)
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5
Q

what is voltage?

A
  • the push around a circuit
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6
Q

what piece of equipment do you use to measure voltage?

A
  • voltmeter
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7
Q

what are the units of voltage?

A
  • volts (V)
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8
Q

what happens when there is low resistance?

A
  • more current
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9
Q

what happens when there is high resistance?

A
  • low current
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10
Q

what are the units of resistance?

A
  • ohms
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11
Q

what is charge?

A
  • rate of the flow of current
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12
Q

what is the units of charge?

A

coulombs (C)

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13
Q

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

A

in ‘new physics booklet’ or online

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14
Q

what is the national grid?

A
  • a network of power stations, power lines, and electricity infrastructure that distributes electricity across the country.
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15
Q

what is a step-up transformer?

A
  • they are used to increase or ‘step up’ voltages
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16
Q

what is a step-down transformer?

A
  • used to decrease or ‘step down’ voltages
17
Q

what happens in an LDR?

A
  • as light increases, the resistance decreases.
18
Q

what happens in a thermistor?

A
  • as temperature increases, the resistance decreases.
19
Q

what is a parallel circuit?

A
  • components are connected across each other, forming multiple branches.
19
Q

what is a series circuit?

A
  • components are connected end-to-end, forming a single path
19
Q

in a series circuit, what happens to the current?

A
  • stays the same
20
Q

in a series circuit, what happens to the voltage?

A
  • it splits
21
Q

in a series circuit, what happens to the resistance?

A
  • it increases
22
Q

in a parallel circuit, what happens to the current?

A
  • it splits (different)
23
Q

in a parallel circuit, what happens to the voltage?

A
  • stays the same
24
Q

in a parallel circuit, what happens to the resistance?

A
  • the total resistance is less than the smallest resistance (decreases)
25
Q

what is meant by AC supply?

A
  • alternating current
  • potential difference and current change direction
26
Q

what is meant by DC supply?

A
  • direct current
  • potential difference and current stays in the same direction
27
Q

what supply do batteries use?

A

DC

28
Q

what supply does mains electricity use?

A

AC

29
Q

why do metal casing objects have an Earth wire?

A
  • 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.
30
Q

what is the voltage and frequency of mains electricity?

A
  • 230 v
  • 50 Hz
31
Q

describe the wires in a plug

A

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

32
Q

how is electricity transported across the UK?

A
  • the national grid

physics paper 1 (4 decks)

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