• Two bulbs of 25 W & 100 W connected in parallel is mounted on a wooden base.
• Two bulbs of 25 W & 100 W connected in series is mounted on a wooden base. When we switch on the parallel board, both bulb of 25 W & 100 W will glow according to their intensities, but when we switch on the series board, the 25 W bulb will glow with greater intensity as compared to 100 W bulb.