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Registered Member #3026
Joined: Fri Jul 23 2010, 02:46PM
Location: Los Angeles, California, U.S.A.
Posts: 54
Hi, Everyone.
I am using a DC power supply to operate my home made, four pole electric motor. When I place my digital ammeter between the power supply and the wall socket I get a reading of 180 milliamps. But when I take a reading between the power supply and the motor, I get a reading of 2.6 amps! How can my motor be drawing more current than it’s own power supply? What am I missing here?
Registered Member #4081
Joined: Wed Aug 31 2011, 06:40PM
Location: UK
Posts: 139
Its watts that equals power, so 180mA at 230 volts = 41.4 watts. A transformer inside the power supply will change the voltage to a lower one, with higher current, albeit with slight losses. So 12V*2.6A=31.2 watts.
Registered Member #2390
Joined: Sat Sept 26 2009, 02:04PM
Location: Milwaukee Wisconsin
Posts: 381
Heres a quick one to remember, from my school days. "ELI the ICE man!" E being voltage leads current in an "L" inductive circuit. I being current leads voltage in a "C" capacitive circuit.
All in all, inductors "L" store current like a "C" capacitor stores voltage. This is what causes "phase shift." You will learn a little more about it when you get to some of your classes. Hope that helps, i never forgot it!
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Ammeter Question
