Question

why voltmeter should always be connected in parallel in a circuit

Answer 1

In order for a voltmeter to measure a device's voltage, it must be connected in parallel to that device . This is necessary because objects in parallel experience the same potential difference. n ammeter measures the electric current in a circuit. ... This is necessary because objects in series experience the same current.

Answer 2

because voltmeter measure voltage in the circuit which is different in all circuits in parallel circuit but in series voltage of all circuits are equal