If a high power heater is connected to electric mains,then the bulbs in the house become dim,because there is a

Consider the following circuit given below. The bulb will light up,if

Find the net emf of the three batteries shown in the figure. (in $, V$)

The resistance of a voltameter is $2\,\Omega$. It is connected in series to a battery of $10\,V$ through a resistance of $3\,\Omega$. In a certain time,the mass deposited on the cathode is $1\,g$. Now,the voltameter and the $3\,\Omega$ resistance are connected in parallel with the battery. The increase in the deposited mass on the cathode in the same time will be .............. $g$.

What is the equivalent resistance between $A$ and $B$ in the figure below if $R = 3\,\Omega$?

The reading of an ideal voltmeter in the circuit shown is.....$V$.