Is electrostatic potential a scalar quantity or a vector quantity?

The rating of an electric heater is $1100 \ W, 220 \ V$. Calculate its resistance when it operates at $220 \ V$. Also,calculate the energy consumed in $kWh$ in the month of November,if the heater is used daily for four hours at the rated voltage.

Two electric bulbs $A$ and $B$ are marked $220\, V, 60\, W$ and $220\, V, 100\, W$ respectively. Which one of the two has greater resistance?

The units of resistance are ampere.

Why is heat produced when a current is passed through a conductor?

Why do the wires connecting an electric heater to the mains not glow while its heating element does?