ELECTRICAL POWER2

"The power of a source (or the power need of a load) can be calculated as the product of the current and voltage (watt = ampere × volt). One watt means that one watt-second (coulomb × volt) energy is provided (used) every second. In more practical units, one watt means that one watt-hour (ampere-hour × volt) energy is provided (used) every hour. "