Question

what is a watt, which is a unit of power, equal to?
a joule times a second
a joule times a meter
a joule divided by a second
a joule divided by a meter

Explanation:

Power is defined as the rate of doing work or transferring energy. The unit of work/energy is the joule (J), and the unit of time is the second (s). Power (in watts, W) is calculated as energy (in joules) divided by time (in seconds), so \( 1 \text{ watt} = \frac{1 \text{ joule}}{1 \text{ second}} \). This eliminates options with meters (since meters are for length, not time related to power) and options with joule times second (which would not represent a rate).

Answer:

a joule divided by a second