Question

A mili ammeter of range 20mA has resistance 2 ohm. To use it as a voltmeter of range 40V, the resistance connected in series with it must be?

Answer 1

Answer:

A mili ammeter of range 20mA has resistance 2 ohm. To use it as a voltmeter of range 40V, the resistance connected in series with it must be

1998 ohm.

Explanation:

Ammeter is used to measure the current in the circuit.

Voltmeter is uesd to measure the voltage in the circuit.

A mili ammeter of range 20mA has resistance 2 ohm. To use it as a voltmeter of range 40V, the resistance connected in series with it must be

$\frac{40}{20*10^{-3} } - 2$

= 1998 ohm

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