Two incandescent lamps connected in series lighting circuit

The schematic diagram of the incandescent lamp circuit shown in the figure is a common lighting circuit for incandescent lamps, using a one-light-one-switch wiring method.
    In the family building of the living area, two incandescent lamps EL1 and EL2 are used in series. According to the principle of series voltage division, the voltage of each incandescent lamp
is lloVl. Although each incandescent lamp is darker, it has a longer service life and is often used for corridor lights.