Unit of energy is
a) Joules
b) watt-seconds
c) watt-hours
d) All the above
Correct Answer: Option D
Solution:
Energy is nothing but capability to do work.
Since Energy = Work-done, its unit is also joules.
Since Power = Rate of work done and $$P=W/t$$ $$P=E/t$$ $$E=Pt$$
Hence unit of energy is also watt-seconds or watt-hours
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