Investigating the effect of the length of wire on the current in a circuit.

Physics Coursework



Plan

I am going to set up the apparatus as shown in the diagram. I will measure the current with varying lengths using an ammeter. To keep it a fait test I will maintain the wire the same thickness and make sure the voltage is constant using a voltmeter. To make the experiment accurate, I will perform it 3 times, recording all 3 sets of results. The length of wire I use will be form 5cm to 45cm. Before I perform the actual experiment I will take out a preliminary test to fore see any problems that may happen during the experiment.





















Theory

The current in a circuit pushes around electric charge. The electric charge in a circuit is carried around by coulombs. Wire is made up of particles. The longer the wire the particles there are for the coulombs to bounce off. The more the coulombs bounce off the particle...