A galvanometer has a coil resistance of R galv = 47.4 . It is to be made into a

Question

A galvanometer has a coil resistance of Rgalv = 47.4 . It is to be made into a voltmeter with a full-scale voltage equal to V = 245.0 V. If the galvanometer deflects full scale for a current of Igalv = 185.5 mA, what size additional resistor should be used?

= __________ 

A galvanometer has a coil resistance of Rgalv = 72.7 . It is to be made into an ammeter with a full-scale deflection equal to I = 1.65 A. If the galvanometer deflects full scale for a current of Igalv = 225 mA, what size shunt resistor should be used?

= __________ 

Explanation / Answer

Rg=47.4ohm

Ig=.1855A

a)V=245V hence, R=V/Ig-Rg=1273.35ohm

b)Rg=72.7

Ig=.225A

I=1.65A hence ,S=IgRg/(I-Ig)=11.47ohm

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