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Find how the length of a wire affects its resistance.

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Tristan LochmanGCSE Physics Coursework AT2

Resistance of a Wire

To find how the length of a wire affects its resistance.

I will measure out lengths of bare wire, all of the same type of metal, thickness, and keep them at the same temperature (to keep the experiment reliable and precise)
I will use constants of voltage and variables of lengths of wire. I will also measure the current and voltage by using a voltmeter and ammeter. Temperature is very important as it can lose energy in the particles and I will measure the resistivity of the circuit without the bare wire.
To measure the resistance of each length of wire by using the equation:
R = V / I

Where R = resistance
V = Pd. Across the conductor
I = current

This formula will give me a result in Ohms.

Ammeter - 0-5 Amperes
Voltmeter - 0-5 Volts

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I will measure:
Volts - voltmeter
Amps - Ammeter
Temperature - close watch on wire (keep voltage low)
Resistance - Formula (R=V/I)

I think that the longer the wire, the more resistance, because electrons lose some of there energy when they collide.

I will keep the voltage low to minimise resistance. This is due to kinetic theory, the more voltage, the hotter the wire, the faster moving particles therefore the more energy lost through collisions.

The graph will be a straight line through the origin, because current is proportional to the voltage, hence the resistance I=V is constant, showing that the wire is an ohm conductor.

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The way I got my results was fair; I controlled temperature, voltage, length of wire, and the resistance in the circuit.
My results were all accurate; I did not get any anomalous results at all because I took more than one result and calculated the average, this increased the reliability of my results. But using a variable resistor would create even more accurate results. By checking my results with formulas from text books it proves my results are accurate enough to support a firm conclusion that resistance is proportional to the length of the wire. To improve the experiment I could use different thickness´ of wire, different materials of wire or use a variable resistor.

...read more.

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