What is the unit of measure for the rate at which work is being done?

The unit of measure for the rate at which work is being done is the Watt. This unit quantifies power, which is defined as the rate of energy transfer or conversion over time. When work is done over a period, power indicates how much energy is used or transferred in that timeframe. One Watt is equivalent to one Joule per second, meaning that if one Joule of work is performed in one second, the rate of work being done is one Watt.

In contrast, while Joules are a measure of energy, they do not specify how quickly that energy is being expended. Volts measure electric potential, and Amperes measure the flow of electric current, neither of which directly relates to the concept of work being done over time. Thus, understanding that power is specifically the rate of doing work clarifies why the Watt is the correct answer.