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Physics - Motor Efficiency

Extracts from this document...

Introduction

Physics Coursework - Motor Efficiency

        In everyday life motors are used all around us, all of the time, in dishwashers, toy cars, or washing machines. So I thought it would be interesting to see how a motor reacts under varying conditions.

In this experiment a weight is suspended by a thread attached to the axle of a small motor. As the motor turns, the thread is wound around the axle to lift the weight. I will be investigating how the efficiency changes when the mass of the weight increases.

Variables:-

Voltage- The voltage applied to the motor.

Weight- The weight lifted by the motor.

Time- The time the motor is switched on.

The variable I have chosen to vary is the mass of the weight, I have chosen “weight”

...read more.

Middle

6.00

0.98

0.40

0.40

2.35

16.92

0.40

0.10

6.00

1.03

0.47

0.38

2.90

13.23

0.45

0.02

6.00

1.12

0.44

0.08

2.96

2.83

0.50

0.00

6.00

1.20

0.71

0.00

5.11

0.00

Results table 2:-

Mass (kg)

Height (m)

Voltage

Current (a)

time (s)

GPE (j)

...read more.

Conclusion

        From my graph there were no anomalous results which I obtained, this shows my results were accurate.  The method was suitable for the experiment conducted. It was a relatively simple experiment and did not involve any complicated apparatus or measurements. I would not change anything to do with the method because the results I obtained were accurate. The setup is very simple but effective for the type of experiment it was.

        My results were reliable and were the results which I predicted, from my results I can form a firm conclusion.

Conclusion-

As the load increases so does the efficiency of a motor, until a certain point, at this point the efficiency starts to decrease because the load is too great.

        To further this experiment I would investigate how voltage and time effect the efficiency of a motor.

...read more.

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