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GCSE Physics Coursework Investigation
Aim
The aim of this investigation is to find out how changing the length of a wire affects the resistance in a circuit.
Introduction
The wire in a lamp has a tendency to restrict the movement of electrons; the amount of restriction that occurs is called the resistance. If the resistance is large, a large voltage is needed to push a current through the wire, however if there is only a small amount of resistance, a smaller voltage is all that is required. To calculate resistance, this equation is used:
OR
Resistance is measured in ohms, named after George Ohm who discovered that the current flowing through a metal wire is proportional to the potential difference (voltage) across it – as long as the temperature stays the same.
Variables
There are four factors affecting resistance:
· The length of the wire – as the length increases, the resistance decreases. ...
· Changing the substance used – materials like Nichrome give more resistance than materials like copper
· The temperature – as the temperature increases, the resistance decreases.
For this investigation I will be changing the length of the wire. ... I will keep the temperature the same as well as the same type of wire.
Approximate Word count = 938
Approximate Pages = 3.8
(250 words per page double spaced)
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