Question

Why should the resitance of an ammeter be very small ?

Answer 1

Just like voltmeters, ammeters tend to influence the amount of current in the circuits they're connected to. However, unlike the ideal voltmeter, the ideal ammeter has zero internal resistance, so as to drop as little voltage as possible as electrons flow through it.

Answer 2

Hey there,

Resistance of an ammeter should be very small, or else, it would affect the amount of current flowing in the circuit.

By Ohm's law, we get that V=IR

This indicates that I=V/R

Since the ammeter is placed in series, and if it woulf have a resistace(say r),
then the new current in the circuit=
I=V/R+r

and hence the current in the decrease.
So an ideal ammeter has zero resistance.

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