Physics 0625 · IGCSE · Energy, work and power

Energy, work and power — practice question

A $40\,\text{W}$ lamp loses $34\,\text{J}$ of energy each second as heat to its surroundings. What efficiency does the lamp have?

  • A$0.15\%$
  • B$15\%$
  • C$18\%$
  • D$85\%$

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