The net resistance of a voltmeter should be large to ensure that :

1. It does not get overheated
2. It draws excessive current
3. It can measure large potential difference
4. It does not appreciably change the potential difference to be measured

Subtopic:  Conversion to Ammeter & Voltmeter |
 50%
From NCERT
PMT - 1999
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A galvanometer having a resistance of 8 ohms is shunted by a wire of resistance 2 ohms. If the total current is 1 amp, the part of it passing through the shunt will be :

(1) 0.25 amp

(2) 0.8 amp

(3) 0.2 amp

(4) 0.5 amp

Subtopic:  Conversion to Ammeter & Voltmeter |
 64%
From NCERT
PMT - 1998
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A voltmeter of resistance 1000 Ω gives full-scale deflection when a current of 100 mA flow through it. The shunt resistance required across it to enable it to be used as an ammeter reading 1 A at full-scale deflection is :

(1) 10000 Ω

(2) 9000 Ω

(3) 222 Ω

(4) 111 Ω

Subtopic:  Moving Coil Galvanometer |
 70%
From NCERT
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If an ammeter A reads 2 A and the voltmeter V reads 20 V, what is the value of resistance R? (Assuming finite resistances of ammeter and voltmeter)
     

1. Exactly 10 ohm
2. Less than 10 ohm
3. More than 10 ohm
4. We cannot definitely say

Subtopic:  Conversion to Ammeter & Voltmeter |
From NCERT
PMT - 2004
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A galvanometer has a resistance of 25 ohm and a maximum of 0.01 A current can be passed through it. In order to change it into an ammeter of range 10 A, the shunt resistance required is 

(1) 5/999 ohm

(2) 10/999 ohm

(3) 20/999 ohm

(4) 25/999 ohm

Subtopic:  Conversion to Ammeter & Voltmeter |
 84%
From NCERT
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A galvanometer has 30 divisions and a sensitivity 16μA/div. It can be converted into a voltmeter to read 3 V by connecting (approximately):

(1) Resistance nearly 6 k Ω in series

(2) 6 k Ω in parallel

(3) 500 Ω in series

(4) It cannot be converted

Subtopic:  Conversion to Ammeter & Voltmeter |
 66%
From NCERT
PMT - 2005
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A voltmeter has a range 0-V with a series resistance R. With a series resistance 2R, the range is 0-V'. The correct relation between V and V' is :

(1) V'=2V

(2) V'>2V

(3) V'>>2V

(4) V'<2V

Subtopic:  Conversion to Ammeter & Voltmeter |
From NCERT
PMT - 2001
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If an ammeter is to be used in place of a voltmeter then we must connect with the ammeter a :

(1) Low resistance in parallel

(2) High resistance in parallel

(3) High resistance in series

(4) Low resistance in series

Subtopic:  Conversion to Ammeter & Voltmeter |
 50%
From NCERT
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A galvanometer with a resistance of 36 Ω is changed into an ammeter by using a shunt of 4 Ω. The fraction f0 of total current passing through the galvanometer will be:

1. 140

2. 14

3. 1140 

4. 110

Subtopic:  Conversion to Ammeter & Voltmeter |
 78%
From NCERT
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A galvanometer, having a resistance of 50 Ω gives a full scale deflection for a current of 0.05 A. The length in meter of a resistance wire of area of cross-section 2.97× 10–2 cm2 that can be used to convert the galvanometer into an ammeter which can read a maximum of 5 A current is (Specific resistance of the wire = 5 × 10–7 Ωm

(1) 9

(2) 6

(3) 3

(4) 1.5

Subtopic:  Conversion to Ammeter & Voltmeter |
 75%
From NCERT
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