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

Potential difference and power — practice question

The diagram depicts a portable generator linked via cables to floodlights. The generator supplies a current of $10\,\text{A}$ at a fixed potential difference (p.d.) of $240\,\text{V}$. The combined resistance of the cables is $2\,\Omega$. What are the p.d. $V$ across, and the power $P$ delivered to, the floodlights?

  • A$V = 220\,\text{V}$, $P = 2000\,\text{W}$
  • B$V = 220\,\text{V}$, $P = 2200\,\text{W}$
  • C$V = 230\,\text{V}$, $P = 2000\,\text{W}$
  • D$V = 230\,\text{V}$, $P = 2300\,\text{W}$

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