Answer: If a low-impedance voltmeter is inserted into a high-resistance dc circuit , a measurement error is created.
Step-by-step explanation:
When a voltmeter is used, it must have as high impedance as possible, due to if it is not the case, it will derive current through the voltmeter (which is in parallel with the circuit element where we want to measure the voltage) , and in this way, the current through the element will not be the one that would circulate without the voltmeter influence.
If we insert a low-impedance voltmeter in a high-resistance dc circuit, the effect will be worse, because the major part of the current will go through the voltmeter, and by application of the Ohm's Law, the measured voltage will be rather lower than the actual voltage.