What is the formula of an ammeter?

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Detailed Solution

An ammeter is an instrument used to measure the current in an electrical circuit. It is connected in series with the circuit through which the current is to be measured.

The formula for the current measurement using an ammeter is derived from Ohm's law, which is:

I=VRI

Where:

I is the current measured by the ammeter (in amperes, A)
V is the voltage across the ammeter (in volts, V)
R is the resistance of the ammeter (in ohms, Ω)

The ammeter has a very low resistance to minimize the voltage drop across it, so the current flow in the circuit is not affected significantly. Ideally, an ammeter has zero resistance, but in practical applications, its resistance is kept as low as possible to ensure accurate readings without affecting the circuit.

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