What is the unit of electrical power?

The unit of electrical power is the watt. Power is defined as the rate at which work is done or energy is transferred over time. In electrical terms, power can be calculated using the formula P = VI, where P is power in watts, V is voltage in volts, and I is current in amperes. Thus, a watt represents one joule per second, indicating how much energy is being consumed or produced in a given timeframe.

Joules, on the other hand, refer to energy, rather than power. Voltage is a measure of electrical potential, and amperes measure the flow of electric current. Each of these terms represents a different aspect of electricity, but only watts specifically measures power, making it the correct answer in this context.