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What affects the resistance of a wire?

Investigation (GCSE coursework)

What affects the resistance of a wire?

I am going to find out what affects the resistance of a wire.
To calculate the resistance I have to do: FORMULAE 1: voltage divided by the current; V/I.
FORMULAE 2: electrical resistivity = (electrical resistance × cross-sectional area) ÷ longitudinal length.

Apparatus

Power supply
1 metre rule (in cm)
Voltmeter- 0 to 5 volts, 10 divisions every volt.
Ammeter- 0 to 1 amp, 0.05 amps.
Heatproof mat.
Variable resistor.
Length of wire (3m)

Variables

Temperature might affect the resistance of a wire.
Thickness might affect the resistance of a wire.
Length might affect the resistance of a wire.
Density might affect the resistance of a wire.
What the wire is made out of might affect the resistance of a wire. (...

Posted by: Asare Mabel

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