One watt is equal to one joule per ______________
a. second
b. newton
c. hour
d. kilogram
Answer is a. second
Rationale:
One Watt is defined as 1 Joule of energy per 1 second.
Power is defined as work per unit of time Power = work done / time needed.
The SI units for work and time are Joules and seconds, respectively.
One Watt was defined as a power of 1 Joule per second.
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