AC electric power
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|
|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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