An electric iron draws a current of $0.5\, A$ when the voltage is $200\, V$. Calculate the amount of electric charge flowing through it in one hour. (in $C$)

$A$ bulb is rated $220\;V$ and $100\;W$. What is the resistance of this bulb?

$(i)$ Draw a circuit diagram to show how two resistors are connected in series.
$(ii)$ In a circuit,if two resistors of $5 \ \Omega$ and $10 \ \Omega$ are connected in series,how does the current passing through the two resistors compare?

Which physical quantity has a unit of $kWh$?

$A$ heater is joined in parallel with a $60\, W$ bulb and connected to the mains. If the $60\, W$ bulb is replaced by a $100\, W$ bulb,will the rate of heat produced by the heater be more,less,or remain the same?

Which law is used to calculate the magnitude of the electric force between two electric charges?