Measuring Devices ( Galvanometer, Voltmeter and Ammeter & Meter Bridge ): Practice Problem & Solution
A galvanometer having a coil resistance of $60 \Omega$ shows full scale deflection when a current of $1.0 \text{ A}$ passes through it. It can be converted into an ammeter to read currents up to $5.0 \text{ A}$ by : (2009)
Solution Explained:
To solve this problem, we apply the core principles of Measuring Devices ( Galvanometer, Voltmeter and Ammeter & Meter Bridge ). Understanding the underlying formula is key to arriving at the correct answer below:
Shunt resistance is connected in parallel and given by $S = \frac{I_g G}{I - I_g} = \frac{1.0 \times 60}{5.0 - 1.0} = 15 \Omega$.
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