Question

why voltmeter cannot connected in series and ammeter cannot be connected in parallel​

Answer 1

Answer:

Voltmeter has very high resistance to ensure that it's connection do not alter flow of current in the circuit.Now if it is connected in series then no current will be there in the circuit due to it's high resistance. Hence it is connected in parallel to the load across which potential difference is to be measured.

Explanation:

Answer 2

Ammeter is connected in series because current remain same in series if connected parallel it won't work properly and show us wrong reading and same with voltmeter if connected in series it will also show wrong reading