Question

A galvanometer having a coil resistance of $60 \,\Omega$ shows full scale deflection, when a current of $1.0 \,A$ passes through it. It can be converted into an ammeter to read current up to $5.0\, A$ by

• A. putting series a resistance of $15\, \Omega$
• B. putting series a resistance of $240 \,\Omega$
• C. putting parallel a resistance of $15 \,\Omega$
• D. putting parallel a resistance of $240\, \Omega$

Answer 1

Answer: (C)

$s=\frac{I_{g} G}{I-I_{g}}=15\, \Omega$ in parallel