Question

A voltmeter is always connected in parallel in the experiment to determine the resistance of a given wire using ohm’s law because it has
A. High resistance
B. Low resistance
C. Sensitive device
D. Non sensitive device

Answer 1

Hint:A voltmeter is a device that is used in an electrical circuit to calculate the electrical potential difference between two points. A sensitive galvanometer (current metre) in series with a high resistance consists of a simple analogue voltmeter. A voltmeter's internal resistance must be high.

Complete answer:
In order for a voltmeter to calculate the voltage of a device, it must be related to the device in parallel. This is important because objects in parallel encounter the same potential difference.

In order for a voltmeter to measure a device's voltage, it must be connected in parallel to that device. This is necessary because objects in parallel experience the same potential difference.

The potential differentiation of the circuit is measured by a voltmeter and it has high internal resistance. The sum of current flowing through the voltmeter is much lower when the voltmeter is attached in parallel with a circuit part. The current through the circuit is however, unmodified.

The voltmeter calculates the difference in voltage between the two different points (i.e. on different sides of the resistor), but the amount of current flowing through the element between the two points does not change. It should then have very high resistance so that it does not attract current into it.

Hence, from the above discussion we can see that option A is correct.

Note:We may be confused between an ammeter and voltmeter. An ammeter has low resistance and a voltmeter has high resistance.Otherwise it would draw considerable current and thereby disrupt the working of the circuit under evaluation. Ammeter has zero resistance and voltmeter has infinite resistance.