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AC electric power

Электрическая мощность переменного тока

Electric power is a physical quantity that characterizes the speed of transmission or conversion of electrical energy. The unit of measure in the International System of Units (SI) is watt (Russian designation: W, international: W).

In AC circuits, instantaneous, active, reactive and total electric power are distinguished. Instantaneous electric power is equal to the product of instantaneous values ​​of voltage and current strength.

Active electric power is equal to the average value of instantaneous power over a period and characterizes the average rate of conversion of electric energy into other types of energy (thermal, mechanical, light, acoustic, etc.).

Reactive electrical power characterizes the rate of accumulation of electrical energy in capacitors and inductors, as well as the exchange of energy between individual sections of the electrical circuit.

Full electrical power characterizes the power given to the circuit by an AC source.

The table shows the power values ​​of some consumers of electric current:

Electrical appliance Power, W
Light bulb one
Network router, hub 10 ... 20
PC system unit 100 ... 1700
Server system unit 200 ... 1500
Monitor for PC CRT 15 ... 200
Monitor for PC LCD 2 ... 40
Household fluorescent lamp 5 ... 30
Incandescent lamp household 25 ... 150
Household refrigerator 15 ... 700
Electric vacuum cleaner 100 ... 3000
Electric iron 300 ... 2,000
Washer 350 ... 2,000
Electric tile 1,000 ... 2,000
Household welding machine 1,000 ... 5,500
Low rise elevator motor 3,000 ... 15,000
Tram engine 45 000 ... 50 000
Electric locomotive engine 650,000
Mine Hoist Electric Motor 1,000,000 ... 5,000,000
Electric motors of a rolling mill 6,000,000 ... 9,000,000

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