1. The charging station applies a direct potential difference across the battery of the car - AQA - GCSE Physics - Question 9 - 2021 - Paper 1
Question 9
1. The charging station applies a direct potential difference across the battery of the car. What does 'direct potential difference' mean?
2. Which equation links e... show full transcript
Worked Solution & Example Answer:1. The charging station applies a direct potential difference across the battery of the car - AQA - GCSE Physics - Question 9 - 2021 - Paper 1
Step 1
What does 'direct potential difference' mean?
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Answer
A direct potential difference means that the polarity of the supply does not change, allowing potential difference to remain in one direction only.
Step 2
Which equation links energy transferred (E), power (P) and time (t)?
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Answer
The correct equation is energy transferred = power × time.
Step 3
Calculate the time taken to fully recharge the battery from zero.
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Answer
To find the time taken, we can use the formula:
t=PE
Substituting the values:
t=7200162000000
Calculating this we get:
t=22500 s.
Step 4
Which equation links current (I), potential difference (V) and resistance (R)?
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Answer
The correct equation is V = I × R.
Step 5
Calculate the resistance of the motor.
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Answer
Using Ohm’s law:
V=I×R
We rearrange to find resistance as:
R=IV
Substituting the given values:
R=15480=32Ω.
Step 6
How does the time taken to recharge a battery using charging system A compare with the time taken using charging system B?
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Answer
The time taken using system A is double the time of system B.
