Question

what should be the resistance of voltmeter and ammeter for accurate reading

Answer 1

Just like voltmeters, ammeters tend to influence the amount of current in the circuits they're connected to. However, unlike the ideal voltmeter, the ideal ammeter has zero internal resistance, so as to drop as little voltage as possible as electrons flow through it.

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Answer 2

Voltmeter is a device of high resistance, since it is connected in parallel.
Ammeter is a device of low resistance to prevent significant loss in current and consequently change the readings.