Difference between ammeter and ohmmeter

An ammeter is an instrument used to measure the current through a circuit is connected in series with the component through which the current is to be measured whereas voltmeter is an instrument used to measure the voltage across the two ends is connected across the end of component across which the voltage has to be measured. Let us have a deep insight into the definition of ammeter, ohmmeter and key difference between them in this article. 

Definition of ammeter:

An ammeter has used for measuring the current in an electronic circuit. Electric currents are measured in amperes, hence the component which measure current is known as an ammeter. It is used to measure smaller currents, in the milliampere or microampere range.

Definition of ohmmeter:

An ohmmeter measures the basically resistance and also a continuity of electrical circuit and their components. The unit of resistance is ohms Ω

Difference between ammeter and ohmmeter:

  • The ammeter measures current while ohmmeter measures resistance.
  • The ammeter is connected in series but in ohmmeter is connected in parallel.
  • In ammeter, the current is measured in amperes while ohmmeter is an electrical instrument that measures electrical resistance in ohms. 
  • Ammeter used to measure smalled currents in the milliampere or some microampere range are designated as millimetres or micrometres while in micro ohmmeter is used low resistance measurement while Megaohammters measure the large values of resistance. 
  • While using an ammeter positive ad negative terminal need to be aligned with a circuit, while checking current, we do not need to take care of positive ad negative terminals while calculating resistance in an ohmmeter. 
  • The ohmmeter is very convenient the use but less accurate compare to an ammeter.
  • An ammeter is four of type permanent moving coil ammeter, moving iron ammeter, electrodynamometer ammeter, rectifier type ammeter while in ohmmeter is of three types series ohmmeter, shit ohmmeter ad multi range ohmmeter, this is the type of construction while in current category there are two types AC ammeter and DC ammeter.


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