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Revision > Physics Y9 Electricity EoT test > Flashcards

Physics Y9 Electricity EoT test Flashcards

1
Q

what is potential difference measured in

A

volts (V)

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2
Q

what is current measured in

A

amps (A)

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3
Q

what is resistance measured in

A

ohms (Ω)

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4
Q

what is the formula for resistance

A

resistance (R) = potential difference (V) / current (I)

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5
Q

what happens if a voltmeter is in series

A

block current completely

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6
Q

a voltmeter has a very low/high resistance

A

high

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7
Q

an ammeter has a very low/high resistance

A

low

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8
Q

what happens if an ammeter is in parallel

A

it creates a short circuit

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9
Q

how is total resistance calculated in a series circuit (2 ways)

A

measure the voltage across battery or add up the resistance of each component

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10
Q

does resistance in a wire change with current

A

no

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11
Q

what is the formula for potential difference

A

potential difference (V) = energy transferred (E) / charge flow (Q)

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12
Q

what is energy transferred measured in

A

joules (J)

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13
Q

what is charge flow measured in

A

coulombs (C)

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14
Q

what is the formula for charge flow

A

charge flow (Q) = current (I) * time (t)

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15
Q

an electric current is a flow of ______

A

charge

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16
Q

voltmeters should be placed in ______

A

parallel

17
Q

ammeters should be placed in ______

A

series

18
Q

what is an ammeter used for

A

measuring current

19
Q

what is a voltmeter used for

A

measuring potential difference

20
Q

what is a variable resistor used for

A

allowing the current to be varied

21
Q

what is this symbol: ⏛

A

fuse

22
Q

what is an electrical conductor

A

a material which allows a current to flow through it when a voltage is established across it

23
Q

what is a fuse used for

A

stopping the flow of electricity if something is wrong

24
Q

why are parallel circuits used for house lights

A

so they can be switched on and off seperately

25
Q

what is a fuse

A

a piece of wire that melts when it gets too hot

26
Q

what is a resistor used for

A

limiting the current in a circuit

27
Q

why does a conductor conduct

A

it is a material that has a mobile charge carrier

28
Q

what is a battery

A

two or more cells connected together

29
Q

what happens if an ammeter is in series

A

it works

30
Q

what happens if a voltmeter is in parallel

A

it works

Revision (19 decks)

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