A student investigated the efficiency of a motor using the equipment in Figure 4 - AQA - GCSE Physics - Question 5 - 2018 - Paper 1
Question 5
A student investigated the efficiency of a motor using the equipment in Figure 4.
Figure 4
When the total power input to the motor was 5 W the motor could not lift... show full transcript
Worked Solution & Example Answer:A student investigated the efficiency of a motor using the equipment in Figure 4 - AQA - GCSE Physics - Question 5 - 2018 - Paper 1
Step 1
Give two conclusions that could be made from the data in Figure 5?
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Answer
As speed increases, the efficiency increases, but the graph tends towards a constant value.
The efficiency appears to reach a limit, suggesting it cannot exceed 100%.
Step 2
Give the main way that the motor is likely to waste energy.
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Answer
The motor is likely to waste energy by heating the surroundings.
Step 3
State the efficiency of the motor.
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