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An ammeter reads upto 1 ampere. Its internal resistance is 0.81ohm. To increase the range to 10A the value of the required shunt is

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Important Questions on Current Electricity

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 180
In a meter bridge experiment, the null point is obtained at 20 cm from one end of the wire when resistance X is balanced against another resistance Y. If X<Y, then where will be the new position of the null point from the same end, if one decides to balance a resistance of 4X against Y?
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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 182
A moving coil galvanometer has 150 equal divisions. Its current sensitivity is 10 divisions per milliampere and voltage sensitivity is 2 divisions per millivolt. In order that each division reads 1 volt, the resistance in ohms needed to be connected in series with the coil will be :-
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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 183

Shown in the figure below is a meter-bridge set up with null deflection in the galvanometer.

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The value of the unknown resistor R is:

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 184
To convert a galvanometer into a voltmeter, one should connect a
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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 185
A galvanometer of 50 Ω resistance has 25 divisions. A current of 4×10-4 A gives a deflection of one division. To convert this galvanometer into a voltmeter having a range of 25 V, it should be connected with a resistance of
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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 186
A galvanometer acting as a voltmeter will have 
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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 187
The resistance of an ammeter is 13Ω and its scale is graduated for a current upto 100A. After an additional shunt has been connected to this ammeter, it becomes possible to measure currents upto 750A by this meter. The value of shunt resistance is :
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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 188
A galvanometer of resistance 50 Ω is connected to a battery of 3 V along with a resistance of 2950 Ω in series. A full-scale deflection of 30 divisions is obtained in the galvanometer. In order to reduce this deflection to 20 division, the resistance in series should be:-