Electromotive force is most closely related to

A car battery has e.m.f. 12 V and internal resistance $\rm 5\; $x$\; 10^{-2}\; \Omega $. If it draws 60 A current, the terminal voltage of the battery will be

An ammeter and a voltmeter of resistance R are connected in series to an electric cell of negligible internal resistance. Their reading are A and V respectively. If another resistance R is connected in parallel with the voltmeter.

A battery is connected in series with a resistance R and a voltmeter. An ammeter is a connected in parallel with the battery.

A milliammeter of range 10 mA has a coil of resistance 1 $\Omega$. To use it as a voltmeter of range 10 V, the resistance that must be connected in series with it is

A voltmeter having a resistance of $\rm 50\;$x$\;10^3 \;\Omega$ is used to measure the voltage in a circuit. To increase the range of measurement 3 times the additional series resistance required is:

Two cells of 1.25 V and 0.75 V are connected in parallel. The effective voltage will be