The resistance of a galvanometer coil is 3.70 ohm, and the current required for

Question

The resistance of a galvanometer coil is 3.70 ohm, and the current required for full scale deflection is 347 mu A. Calculate the resistance of a shunt, R_5, that would covert the galvanometer to an ammeter reading 500 mA full scale. Compute the length of nicrome wire necessary to construct a shunt whose resistance is 0.172 ohm The diameter of the wire is 2.05 mm and its resistive is 53 times 10^-8 ohm-m The resistance of a galvanometer coil is 11.7 ohm, and the current required for full scale deflection is 267 mA. Compute the resistance of the voltmeter multiplier.

Explanation / Answer

full scale current is 267 mA.

that means when 267 mA current passes through it, it will show full scale deflection.

if we want to measure 500 V at full scale deflection.

then our arrangement have to like that 267 mA current will flow when connected to 500 V.

so resistance of apparatus must be :

V = I R

500 = 267 x 10^-3 x R

R = 1872.66 ohm

so We have to add a resistacne in series such that Req= 1872.66 ohm

hence Req = Rv + 11.7 =1872.66

Rv =1860.96 ohm

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