Question

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

Explanation:

Power is defined as the rate of doing work. The formula for power \(P\) is \(P=\frac{W}{t}\), where \(W\) is work (measured in joules, \(J\)) and \(t\) is time (measured in seconds, \(s\)). So, the unit of power (watt, \(W\)) is \(1\space W = 1\space\frac{J}{s}\).

• "a joule times a meter" (\(J\times m\)) has no physical meaning related to power.
• "a joule divided by a meter" (\(\frac{J}{m}\)) is not the unit of power.
• "a joule times a second" (\(J\times s\)) is not the unit of power.

Answer:

a joule divided by a second