Its physical significance lies in that the power of the circuit is directly proportional to the voltage across the circuit and the current intensity in the circuit.
In addition, the unit of electric energy is watt (W), the unit of electric work is joule (J), and the unit of time is second (S). Voltage is measured in volts (V) and current in amperes (A).
Related:
The physical quantity of power indicates the speed at which an object does work. In the physical force W/ time T, the unit of P = work is Watt W, and we often see unit of power as kW, PS, Hewlett-Packard, BHP Billiton WHPMW, etc. In the media and before the Italian resume, the kilowatt here is an international standard unit,1kw =1000 w. If you do 65438 in one second,
In daily life, we often call power horsepower, and the unit of horsepower is horsepower, just like we call torque.
In an automobile, the largest working machine is the engine, and the power of the engine is calculated by torque. The calculation formula is quite simple: power (w) = 2π× torque (Nm)× rotational speed (rpm)/60, and the simplified calculation is: power (w) = torque (Nm)× rotational speed (rpm)/9.549.
Because of the difference between English and metric systems, the definition of horsepower is basically different. British horsepower (HP) is defined as the ability of a horse to pull 200 pounds 165 feet (feet) in one minute. Multiplying this capacity equals 33,000 pounds (feet)/minute. Metric horsepower (PS) is defined as a horse pulling an object weighing 75 kilograms 60 meters in one minute, which is equal to 4,500 kilograms.
After unit conversion, (1lb = 0.454kg; 1 ft = 0.3048m) found 1 horsepower = 4566kg/min. 1ps = 4500kg。 M/min is slightly different, but if converted into watt units (1w =1nm/sec =1/9.8kg.m/sec),1HP = 746w; 1ps = 735w, two different results, the difference is about 1.5%.