In order to increase the range of measuring voltage, ______ is connected in ______ with voltmeter.

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  1. low resistance, parallel
  2. high resistance, series
  3. high resistance, parallel
  4. low resistance, series

Answer (Detailed Solution Below)

Option 2 : high resistance, series
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Detailed Solution

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Explanation:

To increase the ranges of a voltmeter, we need to connect a high multiplier resistance in series with voltmeters.

To increase the range of a voltmeter, we need to the series resistance and it is given by

Where V is the required voltmeter range

Vm is the voltmeter range

Rm­ is the meter internal resistance

Important Points

To increase the ranges of ammeter, we need to connect a small shunt resistance in parallel with ammeters.

We can extend the range of ammeter by keeping a shunt resistance.

Here R= internal resistance of the coil

Rsh = Shunt resistance

I = Required full-scale range

I= Full scale deflection of current

As the two resistances, Rm and Rsh are in parallel, the voltage drop across the resistance is equal.

Where 

‘m’ is called multiplying power

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