How to calculate the wattage?

P in the formula stands for power, the unit is "watt", abbreviated as "watt", the symbol is W, and W stands for work. The unit is "Joule", which is referred to as "Jiao" for short. The symbol J. T stands for time, the unit is "second" and the symbol is "S".

Power can be divided into electricity, power and so on. In a pure resistance circuit, according to Ohm's law, if U=IR is substituted into P=UI, we can get: P = I2r = (U2)/r; In dynamics, the power formula is 1. P=W/t (average power) 2. P = FV； P=Fvcosα (instantaneous power).

Main factors affecting power factor:

The generation of power factor is mainly due to the fact that AC electrical equipment needs reactive power in addition to active power. When the active power p is constant, if the reactive power q is reduced, the power factor can be improved. In extreme cases, when Q=0, its power factor is 1. Therefore, the essence of improving power factor is to reduce the reactive power demand of electrical equipment.

Refer to the above? Baidu Encyclopedia-Power