Assertion: An ammeter is always connected in series whereas a voltmeter is connected in parallel.

Reason: An ammeter is a low-resistance galvanometer while a voltmeter is a high resistance galvanometer.

When a resistance of $100 \mathrm{\Omega }$ is connected in series with a galvanometer of resistance $R$, its range is $V$. To double its range, a resistance of $1000 \mathrm{\Omega }$ is connected in series. Find $R$.

The range of a galvanometer is $V$ when $50 \mathrm{\Omega }$ resistance is connected in series. It gets doubled when $500 \mathrm{\Omega }$ resistance is connected in series. The resistance of galvanometer is,

A galvanometer of resistance $50 \mathrm{\Omega }$ giving full-scale deflection for a current of $10 m\mathrm{A}$ is to be changed into a voltmeter of range 100 V. A resistance of ___ $\mathrm{\Omega }$ is to be connected in series with the galvanometer.

A galvanometer of resistance $50 \mathrm{\Omega }$ gives a full-scale deflection for a current $5\times {10}^{-4} \mathrm{A}$. The resistance that should be connected in series with the galvanometer to read $3 \mathrm{V}$ is,

When a current of $5 \mathrm{mA}$ is passed through a galvanometer having a coil of resistance $15 \mathrm{\Omega }$, it shows full-scale deflection. The value of the resistance to be put in series with the galvanometer to convert it into a voltmeter of the range is,

A galvanometer coil has a resistance of $50 \mathrm{\Omega }$ and the meter shows full-scale deflection for a current of $5 \mathrm{mA}$. This galvanometer is converted into a voltmeter of range, $0-20 \mathrm{V}$  by connecting,

A voltmeter reads $6 \mathrm{V}$ at full-scale deflection and is graded as $3000 \mathrm{\Omega } \mathrm{V}$. What resistance should be connected in series with it so that it reads $12 \mathrm{V}$ at full scale deflection? 

A galvanometer of resistance $G$,$ is shunted by a resistance $S$ ohm. To keep the main current in the circuit unchanged, the resistance to be put in series with the galvanometer is