Question

How are an ammeter and a voltmeter connected in an electric circuit? Why is it so?

Answer 1

ammeter is use to measure current,
which only connect in series.
voltmeter is used to measure potential difference,
which is only connected parallel.

Answer 2

Hey Mate.

Ammeter is connected in series because Ammeter aims at measuring the current flowing through the circuit and hence, it is connected in series: so that the same current that is there in the circuit flows through it and gets measured.

Voltmeter is connected in parallel because voltmeter measures voltage change between two points in a circuit. So u have to place the meter probes at these two points, without removing the portion of circuit between the probes (or else you change the circuit). This then, by definition, places the voltmeter in parallel with the section of circuit between the probes.

Hope this is helpful...