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Effect of length and thickness on resistance
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Investigating the Effect the Thickness of a Wire has On Its Resistance
Equipment:
Nickel Wire cut into 10 pieces of 30cm length (Ruler, Pliers)
Two crocodile clips
Five Pieces of Wire
Power Source
Variable Resistor
Ammeter
Volt Meter
Method:
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F The Circuit was set up as in the circuit diagram overleaf with a
power source of 5 Volts, an ammeter, crocodile clips (holding wires),
and a variable resistor in series and a Voltmeter in parallel with the
wires.
F Nickel chrome wire was then measured to discover the cross section
width with a micrometer screw gauge and this was recorded and the
cross sectional areas was calculated using πr² multiplied each time by
the number of wires used, each bit of wire was cut into lengths of 30
cm
F The crocodile clips held one piece of nickel chrome wire of
thickness 34 mm and length 30 cm at the same point on the ends of the
wire.
F The power source, ammeter and voltmeter were then switched on.
F The voltage and current for the wire were then recorded, and
recorded again when the variable resistor's slider was moved to the
middle and again when the slider was moved to the end.
F The Power was turned off while another was added to avoid
overheating.
F Another wire, or exact same properties (Nickel Chrome, thickness 34
mm and length 30cm) was placed on top of the previous wire, in the
same position, both straight and flat.
F The Power was turned on again and the same procedure was repeated,
recording current and voltage at three points on the variable
resistor.
F This was repeated 10 times in all, each time, an extra wire of exact
same properties (Nickel Chrome, thickness 34 mm and length 30cm) was
placed on top of the previous wire in the same position, all straight
and flat and the current and voltage was recorded at three points on
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