A galvanometer has a coil resistance of 100 Ω and gives full-scale deflection for a current of 1 mA. What shunt resistance should be connected to convert it into an ammeter reading up to 10 A?

PhysicsMediumHigh School (11–12)jee-main

To convert a galvanometer into an ammeter, a low resistance (shunt) $S$ is connected in parallel so that most of the current bypasses the coil. The shunt value is found from $I_g G = (I-I_g)S$ , since the voltage across the galvanometer and shunt must be equal.

A galvanometer has a coil resistance of $100\,\Omega$ and gives full-scale deflection for a current of $1\,mA$ . What shunt resistance should be connected to convert it into an ammeter reading up to $10\,A$ ?

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