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How do u check the voltage of a motor(electric)with a digital multimerter i bought at radio shack???
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Motors don't have voltage (unless they are being used as a generator, of course), motors have impedance. Batteries have voltage.

Are you trying to measure the current draw through a motor, perhaps?

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i mean like how do u check with a multimeterhow much voltage does the motor use
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oh yea how do u check the rpm of the motor???
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So um, why would you want to know the voltage across the motor? Far more interesting is the current draw (as someone said earlier).

At full throttle, the voltage applied to the motor should be close to that provided by your battery pack. At lower speeds, the speed controller supplies less voltage to the motor.

To measure the voltage, stick the red probe on one motor contact and the black one on the other. Really doesn't matter which one goes where, unless your multimeter won't measure negative voltage, in that case swap if you get a wierd reading.

To measure the current, it's a little more difficult. You have to put the multimeter (in ammeter mode) in series with the battery somehow. I won't go into detail how because it's a pain w/o cutting or desoldering wires (and aligator clips are helpful).

pbmax

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how do u measure the rpms???
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Stare really hard at the motor and count the number of times the gear turns :D :D :D

dont laugh i tried that! it doesnt work to well

I imagine you'd go cross-eyed after a while ;)