Question

You are given the following four voltmeters to study the dependence of current (I) on the potential difference (V) across a resistor.



Which one of the above voltmeters would you prefer to use in the circuit to begin your experiment?
(1) A
(2) B
(3) C
(4) D

Answer 1

If the pointer of the scale does not coincide with the zero of the scale, it is called zero error. Before using any voltmeter, we should check for any zero errors in the voltmeter. For experiments, we should always use a zero-error free voltmeter to get accurate measurements. Out of all given voltmeters only D has its pointer coinciding with the zero of the scale, so it should be used for experiments purposes.

Hence the correct answer is option 4.