A galvanometer has a coil resistance of \(100~\Omega\) and gives a full-scale deflection for \(30\) mA of current. If it is to work as a voltmeter in the \(30\) V range, how much resistance does it require to be added?
1. \(900~\Omega\)
2. \(1800~\Omega\)
3. \(500~\Omega\)
4. \(1000~\Omega\)

Subtopic:  Conversion to Ammeter & Voltmeter |
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The galvanometer of resistance \(80~\Omega\) deflects a full scale for a potential of \(20\) mV. How much resistance is required for a voltmeter to deflect a full scale of \(5\) V to be made using this galvanometer?
1.  resistance of \(19.92~ \text{k} \Omega\) parallel to the galvanometer
2. resistance of \(19.92~ \text{k} \Omega\) in series with the galvanometer
3. resistance of \(20 ~\Omega\) parallel to the galvanometer
4. resistance of \(20~ \Omega\) in series with the galvanometer
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A galvanometer with a resistance of \(36~\Omega\) is changed into an ammeter by using a shunt of \(4~\Omega\). The fraction \(f_0\) of total current passing through the galvanometer will be:
1. \(\dfrac{1}{40}\) 2. \(\dfrac{1}{4}\)
3. \(\dfrac{1}{140}\) 4. \(\dfrac{1}{10}\)
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A galvanometer having a coil resistance of \(60~\Omega\) shows full-scale deflection when a current of \(1.0\) A passes through it. How can we convert it into an ammeter capable of reading currents up to \(5.0\) A?
1.  putting in series resistance of \(240 ~\Omega \text {. }\)
2.  putting in parallel resistance of \(240 ~\Omega \text {. }\)
3.  putting in series resistance of \(15~ \Omega \text {. }\)
4.  putting in parallel resistance of \(15~ \Omega \text {. }\)
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A milliammeter of \(10\) mA has a coil resistance of \(1~\Omega\). To use it as an ammeter of range \(1\) A, the required shunt must have a resistance of:

1. \(\frac{1}{101}~\Omega \)

2. \(\frac{1}{100}~\Omega \)

3. \(\frac{1}{99}~\Omega \)

4. \(\frac{1}{9}~\Omega \)

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What properties will a galvanometer that is acting as a voltmeter have?

1. high resistance in series with its coil 2. low resistance in parallel with its coil
3. low resistance in series with its coil 4. high resistance in parallel with its coil
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A galvanometer of resistance \(240~\Omega\) allows only \(4\%\) of the main current after connecting a shunt resistance. What is the value of shunt resistance?
1. \(10~\Omega\)
2. \(20~\Omega\)
3. \(8~\Omega\)
4. \(5~\Omega\)

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When a \(12~\Omega\) resistor is connected in parallel with a moving coil galvanometer, its deflection reduces from \(50\) divisions to \(10\) divisions. What will be the resistance of the galvanometer?
1. \(24~\Omega\)
2. \(36~\Omega\)
3. \(48~\Omega\)
4. \(60~\Omega\)

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On connecting a shunt of \(10 ~ \Omega,\) the deflection in a moving coil galvanometer falls from \(40\) divisions to \(6\) divisions. What is the resistance of the galvanometer?
1.  \(\frac{120}{3}~\Omega \) 2. \(\frac{30}{7}~\Omega \)
3. \(\frac{170}{3}~\Omega \) 4. \(\frac{150}{7}~\Omega \)
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A galvanometer having a resistance of \(8\) ohms is shunted by a wire of resistance of \(2\) ohms. If the total current is \(1~\text{A},\) the part of it passing through the shunt will be:
1. \(0.25~\text{A}\)
2. \(0.8~\text{A}\)
3. \(0.2~\text{A}\)
4. \(0.5~\text{A}\)
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