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1.7 Energy, work and power

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Question 6

A 120 W halogen lamp has an efficiency of 15%. A 25 W LED lamp has an efficiency of 80%.

Each lamp is switched on for the same amount of time.

Which lamp produces more light and which lamp converts more energy into other forms of energy?

A

Produces more light: LED lamp; Converts more energy into other forms: LED lamp

B

Produces more light: LED lamp; Converts more energy into other forms: Halogen lamp

C

Produces more light: Halogen lamp; Converts more energy into other forms: LED lamp

D

Produces more light: Halogen lamp; Converts more energy into other forms: Halogen lamp

Markscheme

1.7 Energy, work and power Questions

  1. IGCSE
  2. /Physics
  3. /1.7 Energy, work and power

533 exam-style questions on CIE IGCSE Physics 1.7 Energy, work and power, covering 1.7.1a Energy stores and energy transfers, 1.7.1b Conservation of energy, 1.7.1c Kinetic and gravitational potential energy, 1.7.2 Work done, 1.7.3 Energy resources, 1.7.3a Energy resources and electricity generation, 1.7.3b Nuclear fusion as an energy source, 1.7.3c Efficiency of energy transfer, and 1.7.4 Power. Each one has a worked solution and a mark scheme showing where the marks go.

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