Assume you measure a power supply voltage through a series 1

Assume you measure a power supply voltage through a series 1M OHM resistor and observe that is drops by 1/2 its former value when no resistor is in series. What is the input impedance of the meter? Explain your answer

Solution

Voltage getting half means voltage is sharing equally between two resistances

Which are 1M ohm and input impedance

Hence the input impedance must be equal to 1 M ohm

Since it resistances are equal then only voltage divided ti half