Quote:
Originally Posted by AdamHeard
Does anyone know a good way to get current draw using a voltmeter and ohms law?
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Yes, of course. I=V/R, right?
So, carefully measure the Resistance of a piece of wire (I think #10 is 0.1 Ohms per foot, but check me on that. Measure several feet, accurately, being sure to subtract the resistance of the test probes). Now you know R
Measure Voltage across R while the motor is running, and do the math to solve for I (in Amperes)
Note that even a small error in R can lead to large errors in I, but this is also good for relative measurements (as in "it's drawing half the current it was drawing before")