Cambridge IGCSE Combined Science practice
Try the question first, then check the answer and practise the same topic again.
At a glance
MCQ
Type
cambridge_mcq
Style
Topic
Energy, work and power
Exam-style question
What is the efficiency of a machine that outputs 50 J of useful energy from 100 J of total energy input?.
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Flashcard 1 of 6
Question 1 of 5
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Description
The light bulb consumes 60 J of electrical energy and produces 10 J of light energy.
Calculate the efficiency of the light bulb.
Aim for approximately 2 distinct marking points.