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

Potential difference and power — practice question

A power supply is linked to a component by connecting wires whose total resistance is $4.9\,\Omega$. The power supply delivers an output power of $3.6\,\text{W}$ and has a terminal potential difference of $12\,\text{V}$. Calculate the amount of thermal energy dissipated in the connecting wires during a time of $1.0$ hour?

  • A$0.44\,\text{J}$
  • B$29\,\text{J}$
  • C$1.6\,\text{kJ}$
  • D$11\,\text{kJ}$

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