The units of measurement for electric current is amperes (A) Earlier ammeters were laboratory instruments which depend on the earth’s magnetic field for operation. AmmeterĪ measuring instrument which is used to measure the electric current in a circuit is known as an ammeter. The scale of the galvanometer was marked in ohms (Ω), because the fixed voltage from the battery assures that the resistance decreases and the current through the meter increases. ![]() It uses a galvanometer to measure the electric current through the resistance. Originally, ohmmeter is designed with a small battery to apply a voltage to a resistance. Resistance values are measured in ohms (Ω). Similarly meg-ohmmeters is used to make large resistance measurements. The instrument used to measure small value of resistance are micro-ohmmeters. ![]() ![]() An electrical instrument that measures electrical resistance is known as an ohmmeter.
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