Multiply the power factor by the efficiency of the engine. Divide step 1 by step 2. A rock crusher has a power of 40Hp, a power factor of 0. A steel bending machine has a power of 20Hp, with a power factor of 0. An engine for an electric curtain has a power of 7. Horsepower is a unit of mechanical power, while kVA kilovolt-amps is a unit used to classify electrical power. It is also called as useful power or active power of the system. The value of kVA is equal to kW in DC voltage devices because the current and voltage of the circuit are in the same phase.
Whereas in AC voltage devices, due to the power factor of the electrical devices kVA is greater than kW. Power factor — It is the ratio between the resistance of the circuit and the impedance of the circuit. If the resistance and the impedance of the circuit is the same, power factor becomes 1 which is for a purely resistive circuit.
The ratio between the power that can be used and the apparent power of the particular device. Close Privacy Overview This website uses cookies to improve your experience while you navigate through the website. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website.
We also use third-party cookies that help us analyze and understand how you use this website. These cookies will be stored in your browser only with your consent. KVA is larger than KW because loads are inductive such as motors, discharge lighting, reactors and more current is required to keep the magnetic field energized than is -turned into heat KW. Inductive devices or loads such,. Motor Efficiency: Electric motor efficiency is the ratio between power output mechanical and power input electrical.
Mechanical power output is calculated based on the torque and speed required i. Mechanical power output is always lower than the electrical power input, as energy is lost during conversion electrical to mechanical in various forms, such as heat and friction.
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