What is an Ammeter
When the current in a circuit is substantially less than an ampere, its value is determined by the use of a milliammeter or micro-ammeter, which measures full-scale currents in milli-amperes or microamperes, respectively. The symbol for the ammeter is a circle with the enclosed letter A, as shown in the following figure.
In the above figure, an ammeter is inserted into the path of a current, that is, in series, so as to carry the current being measured.
Types of Ammeter
Depending on the constructing principle, there are many types of ammeter we get, they are mainly –
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Permanent Magnet Moving Coil(PMMC) ammeter.
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Moving Iron (MI) Ammeter.
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Electrodynamometer type Ammeter.
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Rectifier type Ammeter.
Depending on this types of measurement we do, we have-
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DC Ammeter.
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AC Ammeter.