A silver and zinc voltameter are connected in series and a current $i$ is passed through them for a time $t$ liberating $W\, gm$ of zinc. The weight of silver deposited is nearly ..............$W$
$0$
$1.7$
$2.4$
$3.5$
Which device can convert all electrical energy into heat
Consider four circuits shown in the figure below. In which circuit power dissipated is greatest (Neglect the internal resistance of the power supply)
Two heater wires of equal length are first connected in series and then in parallel. The ratio of heat produced in the two cases is
A cell of $e.m.f.$ $1.5\,V$ having a finite internal resistance is connected to a load resistance of $2\,\Omega $. For maximum power transfer the internal resistance of the cell should be ............. $ohm$
Find the power of the circuit ............ $W$