As we all know, resistance is the measurement of an electrical circuit’s resistance to current flow. The current is measured with an ammeter, while the potential difference is measured with a voltmeter. To answer the question, we’ll employ these fundamental principles.

The complete step-by-step approach is as follows:

A). Because a resistance resists the passage of current in a circuit, the resistance in an ammeter should be very tiny because it should not affect the value of the current flowing in the circuit, i.e., the current should not change.
B). Also, because resistance resists the passage of current in a circuit, the resistance of a voltmeter should be very high so that it takes very little current, i.e. if resistance is high, the voltage flowing in a circuit will be higher, resulting in very little current flow.