How do you calculate the shunt required to increase the range p times?

1.	How do you calculate the shunt required to increase the range p times?
Answer» The value of shunt resistance required to convert a galvanometer into an ammeter is given by, S = \(\left(\cfrac{I_g}{I-I_g}\right)G\) If the current I is p times the current I_g , then I = pI_g . Using this in the above expression, we get, S = \(\cfrac{GI_g}{pI_g-I_g}\) OR S = \(\cfrac{G}{p-1}\) This is the required shunt resistance to increase the range p times.

Answer»

The value of shunt resistance required to convert a galvanometer into an ammeter is given by,

S = \(\left(\cfrac{I_g}{I-I_g}\right)G\)

If the current I is p times the current I_g , then I = pI_g . Using this in the above expression, we get,

S = \(\cfrac{GI_g}{pI_g-I_g}\) OR

S = \(\cfrac{G}{p-1}\)

This is the required shunt resistance to increase the range p times.

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