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Grade 12Electric Current

A galvanometer of resistance 20 ohm gives a full scale deflection when a current of 0.04A is passed through it. It is desired to convert it into an ammeter of full scale reading 20A. The only shunt availaible is 0.05 ohm resistance. The resistance that must be connected in series with the coil of galvanometer is?

Anurag Kshatri

12 Years agoGrade 12

1 Answer

Ashish Kumar

12 Years ago

The maximum current for full scale deflection of the galvanometer is 0.04 A.

To convert this to an ammeter the 20 A current will be distributed in the shunt and the galvanometer branch.

for full scale deflection, 0.04 = 0.05/ (20 + R + 0.05 ) 20 ( distribution of current in parallel combination )

R = 25 - 20.05 = 4.95 ohms

The fig. Shows a network of resistance in which the point A is earthed

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