More Wire The Charge example essay topic
380 words
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 5 cm to 45 cm.
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 particles the more they vibrate, the more they vibrate, the more heat they create.
The hotter the coulombs get the more resistance there will be. Hypothesis The longer the wire the lower the current will be. This is because the more wire the charge has to pass through, the more energy it uses up as there are more particles so there is a bigger chance of the coulombs colliding with them. When the coulombs collide with the particles they vibrate and they get hotter. I think that the longer the wire the higher the resistance will be. Apparatus Power pack cables Voltmeter Ammeter Crocodile clips Metre rule 1 piece of wire.
Method. Set up apparatus as shown in the diagram... Measure the length of the wire held by the crocodile clips to 5 cm... Record the current in amps in a table... Repeat the above with different lengths of wire, keeping the voltage input the same the same throughout the experiment. Results Table The voltage was kept constant at 7.0 volts.
This because the current in a circuit pushes around electric charge. My results agree with my hypothesis.
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