Electrical power is a physical quantity characterizing the rate of transfer or conversion of electrical energy. The unit of measurement in the International System of Units (SI) is watt (Russian designation: W, international: W).
In AC circuits, there is instantaneous, active, reactive, and total electrical power. The instantaneous electrical power is equal to the product of the instantaneous values of voltage and current.
Active electric power is equal to the average value of the instantaneous power over a period and characterizes the average rate of conversion of electrical 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 parts of the electrical circuit.
The total electrical power characterizes the power delivered to the circuit by the 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 block||200 ... 1500|
|CRT PC Monitor||15 ... 200|
|Monitor for PC LCD||2 ... 40|
|Fluorescent Household Lamp||5 ... 30|
|Household incandescent lamp||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 house lift engine||3,000 ... 15,000|
|Tram engine||45,000 ... 50,000|
|Electric locomotive engine||650,000|
|Electric motor lifting machine||1,000,000 ... 5,000,000|
|Rolling mill motors||6,000,000 ... 9,000,000|
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