In a Voltaic cell,what is the direction of the flow of electrons in the external circuit?

$(a)$ How much current will an electric bulb draw from a $220 \ V$ source,if the resistance of the bulb filament is $1200 \ \Omega$?
$(b)$ How much current will an electric heater coil draw from a $220 \ V$ source,if the resistance of the heater coil is $100 \ \Omega$?

$A$ potential difference $V$ is applied across a conductor of length $L$ and diameter $D$. How is the resistance $R$ of the conductor affected,when in turn $(i)$ $V$ is halved,$(ii)$ $L$ is halved,and $(iii)$ $D$ is doubled? Justify your answer in each case.

An electric heater rated $600 \ W$ operates $6$ hours per day. Find the cost to operate it for $30$ days at ₹ $3.00$ per unit.

Which solution is used as an electrolyte in a Voltaic cell?

Electric current flows through three lamps when arranged in $(a)$ a series and $(b)$ a parallel circuit. If the filament of one lamp breaks,explain what happens to the other two lamps in both cases.