Which electrical unit is equivalent to one joule per second?

The correct answer is based on the definition of the watt, which is the unit of power in the International System of Units (SI). A watt is defined as the rate of energy transfer equivalent to one joule of energy used per second. This means that when an electrical component consumes one joule of energy in one second, it is said to be operating at one watt.

Understanding this concept helps in practical applications, such as calculating energy consumption in electrical devices, where knowing the power rating in watts can provide insights into efficiency and operational costs.

On the other hand, while a volt is defined as the difference in electric potential that will drive one ampere of current against one ohm of resistance, it is not a measure of power. An ohm is a measure of electrical resistance, denoting how much a material opposes the flow of electric current. An ampere measures the flow of electric current but does not directly represent power either. These distinctions reinforce why watt is the appropriate answer for representing joules per second, aligning perfectly with the definitions and relationships established in electrical engineering.