1. The problem statement, all variables and given/known data If I had two DMM's, how would I use one of them to measure the current that another DMM uses to measure the resistance of a circuit element. How would I use a DMM to measure the resistance of a shunt resistor that another DMM uses to measure current in a circuit? 2. Relevant equations V=IR 3. The attempt at a solution Well for the first part, I know that when a DMM measures resistance, it sends a constant current through resistor and the voltmeter part of the DMM measures the voltages across that element which is caused by the current, and then simply divides that voltages by current to get resistance. So in order to find the constant current that the DMM outputs, would I just put another DMM in series with the first DMM and resistor ? For the second part, I'm still trying to figure out how a DMM measures current. All I know is that it is a voltmeter attached to a shunt resistor. Once I can figure this out, I can figure out how to measure the resistance of the shunt resistor. Any help is appreciated and I will use the rep system to those who help. Thank you.