To increase sensitivity, increase ( N ), ( B ), or ( A ), or decrease ( k ). 7. Conversion into Ammeter A galvanometer can measure only small currents (μA to mA range). To measure larger currents, a low resistance called a shunt (( S )) is connected in parallel with the galvanometer.
Let ( I ) = total current to be measured, ( I_g ) = full-scale deflection current of galvanometer, ( R_g ) = galvanometer resistance. project file on moving coil galvanometer for class 12 pdf
Voltage across shunt = Voltage across galvanometer [ I_g \cdot R_g = (I - I_g) \cdot S ] [ S = \fracI_g R_gI - I_g ] To increase sensitivity, increase ( N ), (