Input Impedance
Voltage Measurement
Most multimeters will have an input impedance of 10Mohm.
This means it will effectively apply a resistance across what you measure of 10Mohm, potentially affecting the measurement if the source has a high impedance
Current Measurement
Will depend on the meter, but it might be say 1ohm for the mA range and say 10mohm for the 10A range.
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