Question

what will happen if we connect an ammeter in parallel. will it not measure the total current in the circuit?

Answer 1

An ammeter is connected in series with the circuit because the purpose of the ammeter is to measure the current through the circuit. Since the ammeter is a low impedance device, connecting it in parallel with the circuit would cause a short circuit, damaging the ammeter and/or the circuit.

1) It should be connected in series, so that maximum current can pass through it, for accurate measurement of current.

2) its resistance is very low, if it is connected in parallel in a circuit, it will by the current, and current can not be measured accurately.
if you do not connect the ammeter in series you will shunt the load, basically excluding the resistive element of the circuit.

so we will not get accurate measurements, beacause of short circuit and damagement of circuit