Watt is the unit of power of the International System of Units. In daily life, it is more commonly used in kilowatts, 1 kW = 1000 watts. Watt is defined as 1 joule/second (1J/s), that is, the rate of energy converted, used or dissipated (measured in joules) per second. In the electrical unit system, it is volt times ampere (1V A, abbreviated as 1VA).