An engineering company has invented pavement tiles that generate electricity as people walk on them - AQA - GCSE Physics - Question 3 - 2022 - Paper 1
Question 3
An engineering company has invented pavement tiles that generate electricity as people walk on them.
Figure 3 shows someone walking on the pavement tiles.
Use the ... show full transcript
Worked Solution & Example Answer:An engineering company has invented pavement tiles that generate electricity as people walk on them - AQA - GCSE Physics - Question 3 - 2022 - Paper 1
Step 1
What equation links current (I), potential difference (V) and power (P)?
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Answer
The equation that links current (I), potential difference (V), and power (P) is:
P=V×I
This is the correct choice, as indicated in the marking scheme.
Step 2
Calculate the current in the tile.
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Answer
To calculate the current (I) when a potential difference of 40 V is induced and the power output is 4.4 W, we can rearrange the power equation:
P=V×I
Substituting the known values:
4.4=40×I
Now, solving for I:
I=404.4
Thus, the current is:
I=0.11A
Step 3
What equation links efficiency, total power input and useful power output?
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Answer
The equation that links efficiency, total power input, and useful power output is:
Efficiency=total power inputuseful power output
This choice is correct as it accurately describes the relationship between these quantities.
