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physics > resistance of a wire practical > Flashcards

resistance of a wire practical Flashcards

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1
Q

what is current measured in

A

amps

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2
Q

what is pd measured in

A

volts

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3
Q

what is used to measure current

A

ammeter

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4
Q

what is used to measure potential difference

A

voltmeter

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5
Q

how should an ammeter be connected to determjnd the current rhoufh a component

A

in series

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6
Q

how should a voltmeter be connected to determine the potential difference across a component

A

in parallel

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7
Q

how could you tell if an ammeter of voltmeter have zero errors

A

they would show a reading when not connected in a circuit

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8
Q

when investigating length of wife and resistance what should be controlled

A

temperature, material of wire, thcikness of wire

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9
Q

how could temp be controlled when investiagting resistance

A

turn the power supply off between readings to prevent components warming up

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10
Q

what is the equation that links current potential difference and resistance

A

resistance = potential difference/ current

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11
Q

what is the unit for resistance

A

ohms ♎️

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12
Q

how would you know if your results were precise

A

measurements would be closely grouped together

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13
Q

what are the hazards in the experiment

A

the high current can cause the wite to get hot and melt, can also cause burns

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14
Q

what is the dv in the resistance of a wite investiagaation

A

resistance of the wire

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15
Q

what is the iv in the resistance of the wire practical

A

lenght of wire

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16
Q

what are the measurements taken in the investigation

A

the current and potential difference

17
Q

whu should the variable resistor be adjusted each yime the lenght of the wire is changed

A

changes the resistance of the wite sk that current remains the same so thag the temp of the wire is kept constant

18
Q

what effect does temp have on resistance of a wire

A

increase resistance

19
Q

what effect would a thicker wire have on resistance

A

resistance would decrease

physics (11 decks)

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