In this article, we will discuss about difference between ammeter and voltmeter.
Ammeter is an instrument which is used to measure electric current in an electric circuit.
An ammeter is connected in series with the circuit to load whose current is to measured. The operating coil of the instrument is to carry the whole of the current to be measured. When current flows through the operating coil deflecting torque is produced. The resistance of coil should be very low because coil carry the whole current of the circuit. Hence operating coil of an ammeter should have a few turns of thick wire.
Voltmeter is an instrument which is used to measure voltage or potential difference between two points in an electric circuit.
A voltmeter is connected in parallel with the load or portion of the circuit whose voltage is to measured. The deflection of the meter depends upon the current flowing through the operating coil which is proportional to the voltage across the voltmeter. The resistance of coil should be very high because voltmeter is connected in parallel with the load. Hence operating coil of an voltmeter should have a large number of turns of thin wire.