Physics 9702 · AS & A Level · Potential difference and power

Potential difference and power — practice question

As a petrol car is being refuelled, it receives $50$ litres of fuel in $90$ seconds. Each litre of petrol contains $34\,\text{MJ}$ of energy. If an electric car is to obtain the same total energy in the same period from a $230\,\text{V}$ supply, what minimum current is needed?

  • A$2700\,\text{A}$
  • B$8.2 \times 10^4\,\text{A}$
  • C$7.4 \times 10^6\,\text{A}$
  • D$6.6 \times 10^8\,\text{A}$

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