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A galvanometer has a resistance of 30Ome...

A galvanometer has a resistance of `30Omega` and a current of 2 mA is needed to give full scale deflection. What is the resistance needed and how is it to be connected to convert the galvanometer (i) into an ammeter of 0.3 A range and (ii) into a voltmeter of 0.2 V range?

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The correct Answer is:
(i) `(30)/(149)Omega` in parallel, (ii) `70Omega` in series
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SL ARORA-ELECTRICAL INSTRUMENTS-Problem for self practice
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  2. It is intended to measure a maximum current of 25 A with an ammeter of...

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  4. A galvanometer has a resistance of 100Omega. A difference of potential...

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  5. When a galvanometer having 20 divisions scale and 50Omega resistance i...

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  6. A galvanometer has a sensitivity of 60 division/ampere. When a shunt i...

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  7. A galvanometer of resistance 3663Omega gives full scale deflection for...

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  8. A shunt of 6Omega is connected across a galvanometer of resistance 294...

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  9. A galvanometer is shunted by 1/n th of its resistance. Find the fracti...

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  10. If a galvanometer is connected in series with a high resistance so tha...

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  11. A galvanometer has current sensitivity of 5 divisions/mA and a voltage...

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  12. A 250muA meter has 50 divisions and it needs 250 mV for full scale def...

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  13. It is required to pass only one-tenth of the main current through a ga...

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  14. With a potentiometer, null points were obtained at 140 cm and 180 cm w...

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  15. In a method for comparing emfs by a potentiometer a balance point is f...

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  16. In a potentiometer with a cell of unknown emf the balance point was ob...

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  17. A potentiometer having a wire 10 m long stretched on it, is connected ...

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  18. With a certain cell, the balance point is obtained at 60 cm from the z...

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  19. With a cell of emf 1.5 V, the balance point is obtained at a distance ...

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  20. A 10 metre long potentiometer wire carries a steady current. A 1.018 v...

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