1. The problem statement, all variables and given/known data Provided that the input resistance of the DMM is much larger than the resistance values in the circuit to which it is connected, the DMM will not draw a significant current. Estimate the input resistance of the DMM by connecting the 10 M resistor supplied in series with it and noting the voltage reading when this series combination is connected to your DC black box. Explain clearly the logic of doing this. Basically I have a simple circuit with a DC black box which is a box with a 1.5V battery and three resistors (1 in series and 2 in parallel) and I have a digital multimeter that I have to estimate its internal resistance by connecting a 10 MΩ resistor to the circuit in series with the multimeter. I can't really think of why connecting such a large resistor would help determine the internal resistance. 3. The attempt at a solution I haven't been able to come up with an answer because first I need to understand the role of the 10 MΩ resistor.