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Physics investigation – Factors Affecting Resistance

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Introduction

Physics investigation - Factors Affecting Resistance Aim : T o find out how the varying length of a wire affects the amount of resistance Method * Get all equipment together that will be required; a power pack, a rheostat, voltmeter, ammeter, Constantium wire, leads and crocodile clips and check that all of these work correctly before setting up circuit as below Variable length of wire * Check that the circuit works correctly and that all wires are connected correctly, positive to negative ...read more.

Middle

each end of the wire into the circuit in the place as shown above * Using the rheostat to vary the voltage and measuring accurately with the voltmeter, set the voltage first to 3V and record, using the ammeter accurately, the current * Then repeat this, setting the voltage next to 4V and then to 5V, checking readings each time * Repeat this process of three readings with lengths of wire that are 20,30,40,50,60,70,80,90 and 100 cm long, making sure that you take ...read more.

Conclusion

average resistance for each length of wire from the three voltages, and plot a graph to show how the resistance varies with the different lengths of wire Prediction I predict that as I increase the length of the wire, the resistance in the wire will also increase because with the longer length of wire the flow of electrons will be slowed down because of more electrons in the wire to cause the electrons to flow at a slower speed, therefore increasing the resistance. ...read more.

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