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# Current and Resistance Physics Investigation.

Extracts from this document...

Introduction

## Current and Resistance Physics Investigation

Aim:

Investigate how the length of a wire affects the current and resistance of a wire.

Prediction and Hypothesis:

I think as you increase the length of the Constatan wire, you also increase the amount of resistance. The current is the flow of electrons; the current is dependent on the amount of voltage, which is applied. Voltage is the push given to the current. The current has to go through a circuit, which contains resistance so if you increase that push you also increase the flow of the current. All materials have a slight

Middle

4.7

4.5

1.1

60cm

2.3

2.4

2.2

2.5

2.4

2.1

90cm

1.8

1.7

1.7

1.9

1.8

2.8

120cm

1.6

1.5

1.5

1.6

1.5

3.3

150cm

1.2

1.2

1.3

1.3

1.25

4

Voltage used 5 Volts

 Length Current (1) Current (2) Current (3) Current (4) Average Resistance

Conclusion

rowspan="1">

2

120cm

1.7

1.8

1.6

1.6

1.7

2.9

150cm

1.3

1.2

1.4

1.4

1.3

3.8

Results

 30cm 1.7 1.6 1.8 1.7 1.7 0.9 60cm 0.9 1 1.1 1 1 1.5 90cm 0.5 0.6 0.6 0.6 0.6 2.5 120cm 0.4 0.5 0.4 0.4 0.4 3.8 150cm 0.3 0.5 0.4 0.4 0.4 3.8

Conclusion

I came to a conclusion that the decrease in current is the increase in resistance this is because the current although less of it they collide with the resistance causing a decrease in the output voltage.

Evaluation

The experiment proved to be a success and it went very well although it could be improved by trying other lengths, different voltages but also a different type of wire to be able to compare the resistance difference this would make a more interesting experiment

This student written piece of work is one of many that can be found in our AS and A Level Electrical & Thermal Physics section.

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