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Investigating electric current in an electric circuit

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Introduction

Matt Hesketh

Investigating electric current in an electric circuit

Introduction: Resistance is how difficult it is for electricity to pass through an electric circuit. Because the electrons pass through against the current the longer the wire the more the resistance, but the wider the wire the more room the electrons have too pass through so it is easier. The electrons, which pass through the circuit, are the free electrons in the metal that the wire is made out of.

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Middle

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Lots of electrons so harder to pass through

Aim: To discover if and how the length of a wire effects the resistance of an electric circuit.

Plan

I am going to do an experiment to investigate if the length of a wire effects the resistance of a circuit

Safety I will have to a make sure there that I take some safety precautions before I do this experiment like the usual do not sit down while doing the experiment wear safety spectacles and a lab coat make sure the area is clear and there is no water about as we using electricity.

Fair test: To make this a fair test I

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Conclusion

Evaluation

The results were not as accurate as they could have been because of the flickering ammeter and voltmeter which could have altered the average reading which is what my graph is plotted on. The length of wire may have been measure imperfectly and the sallotape that held the wire down restricted the maximum length. There could also have been kinks in the wire affecting the measurement or short circuiting the wire however on the whole my experiment showed that resistance increases as the length of a wire increases.

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