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1.7.1a Energy stores and energy transfers

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Question 130

An LED light bulb uses 2000 J of electrical energy. It provides 760 J of useful light energy.

What is the efficiency of the LED light bulb?

A

3.8%3.8\%3.8%

B

6.2%6.2\%6.2%

C

38%38\%38%

D

62%62\%62%

Markscheme

1.7.1a Energy stores and energy transfers Questions

  1. IGCSE
  2. /Physics
  3. /1.7.1a Energy stores and energy transfers

229 exam-style questions on CIE IGCSE Physics 1.7.1a Energy stores and energy transfers. Each one has a worked solution and a mark scheme showing where the marks go.

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