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Briefly explain how you will convert a moving coil galvonometer into a voltmeter of given range. |
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Answer» Solution :Let us have a MOVING coil galvanometer of resistance `R_G`, which gives FULL scale deflection for a current `I_g`. THUS, it can MEASURE a maximum potential difference of `I_g.R_G`. To convert the galvanometer into a voltmeter of given range V, we must join a suitable high resistance R in series to the galvonometer so that `V = I_(g) cdot (R_G + R) implies R = V/(I_g) - R_G` As in a voltmenter resistance of galvanometer `R_G` and series resistance R are joined in seires, the NET resistance of voltmeter `(R_V)` is given by 
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