Which of the following units relates to electrical power?

The unit that directly relates to electrical power is the Watt. In electrical systems, power is defined as the rate at which electrical energy is transferred by an electric circuit. The relationship among power (measured in Watts), voltage (measured in Volts), and current (measured in Amperes) is encapsulated in the formula: Power (P) = Voltage (V) × Current (I). This means that one Watt represents one Joule of energy transferred per second, making it the foundational unit for measuring electrical power.

Other units listed, such as the Volt and Ampere, measure different aspects of electricity. Volts measure the electric potential difference, or the force that pushes electric charge through a circuit, while Amperes measure the flow of electric charge or current. Joules, on the other hand, measure energy, which can be related to power (since power is energy over time), but they do not represent the rate of energy transfer in the way that Watts do. Thus, the Watt is uniquely positioned as the unit that represents electrical power.