Question

You would suggest student while performing he finds that pointer of ammeter and voltmeter don't coincide on zero marks on scale when circuit is open.​

Answer 1

I just find it;

it is zero connection

Answer 2

Every simple meter have zero modifications, which should be possible utilizing a screwdriver.

It is fundamental prerequisite to check zero setting before beginning estimation, and modify the pointer to address zero position.

Be that as it may, some perusing is conceivable if the closest zero setting position is done and deviation noted.

It is conceivable in some cases that a meter may have so much blunder that zero may not be movable.