Exam-style question
Try this first
A light bulb has a useful power output of 60 W and an efficiency of 0.15. What is the total power input?.
- A.400 W
- B.300 W
- C.450 W
- D.500 W
Answer and explanation
Attempt the question first, then reveal the model answer and explanation.
Common mistake
No common mistake is linked to this question yet.