Physics 0625 · IGCSE · Energy, work and power

Energy, work and power — practice question

A $150\text{ W}$ filament lamp has an efficiency of $10\%$. A $40\text{ W}$ compact fluorescent lamp (CFL) has an efficiency of $30\%$. Both lamps are turned on for the same length of time. Which lamp gives out more light, and which lamp changes more energy into other forms of energy?

  • Aproduces more light: CFL lamp; converts more energy into other forms: CFL lamp
  • Bproduces more light: CFL lamp; converts more energy into other forms: filament lamp
  • Cproduces more light: filament lamp; converts more energy into other forms: CFL lamp
  • Dproduces more light: filament lamp; converts more energy into other forms: filament lamp

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