My parents said, long extension cord will drink more electricity. Can someone comfirm it? or does it have other problem?
also, the long extension cord are connected to one of those mulit-plug for a PC.
A long cord, carrying near its rated load, loses power by heating - if you consider that drinking, then yes. It doesn't drink it all by itself. A cord has resistance. A longer cord has more. A smaller cord has more resistance than a larger diameter cord. A 100 foot 16 gauge cord - like those sold cheap in hardware stores - has enough resistance that if you pull more that 13 amps through it, the voltage at the end will drop by an unacceptable amount, so it is only rated 13 amps, not the 15 the plug would suggest or that shorter cords the same size are rated.
It will probably not create a problem with computers, but it is critical with power saws which can burn out because they slow down at lower voltage, the back EMF falls, and they try to draw MORE amps, lowering the voltage even more.
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