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1 vote
All I need help on, is the first one on the top row. Thanks :))

All I need help on, is the first one on the top row. Thanks :))-example-1
User Nick Burke
by
6.6k points

2 Answers

9 votes

Answer:

1a)40-27=13

1b) heat

1c)efficiency = W out/W in

so 27/40= 67%

User Meathanjay
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7.7k points
12 votes
13J is wasted energy.
The wasted energy is thermal energy (heat).
The light bulb’s efficiency is 67.5%
User Alind Billore
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6.3k points