Explanation: Electrical power, the rate at which electrical energy is transferred or consumed, is fundamentally measured in Watts. A Watt (W) is the standard International System of Units (SI) derived unit for power, named after James Watt. Delving deeper into its definition, one Watt is precisely equivalent to one Joule (J) of energy transferred or dissipated per second (s). Therefore, expressing power as "Joule per second" (J/s) is simply stating the fundamental definition of the Watt in terms of base SI units. Both "Watt" and "Joule per second" refer to the same physical quantity and have identical meaning. Understanding this relationship is crucial for comprehending energy transfer in radio circuits and equipment. Therefore, both A and B are correct descriptions of the unit of electrical power.