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Depends on the current. Put a resistor in-line with the current, then measure the

voltage across the resistor. V=RI. So, divide the measured voltage by resistor

value. Be careful with the size of the resistor, as Power dissipated in a resistor is

R*I^2 or V^2/2. So, a 1-Amp current into a 1 Ohm resistor will result in a 1Watt

power dissipated in the resistor. If it's too small, it'll burn.

Also, notice that if you do that, you haven't measured the current in the original circuit.

You've measured the current when an extra resistor is installed in the original circuit, and

that's different.

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