The following bulbs are rated at 40W, 60W and 100W. Which 1 will glow when connected in series to a supply of 220V
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When connected in series: In a series connection, current flowing across each element in circuit is same. So when 40W bulb, 60W bulb and 100W bulb are connected in series, same current will flow through them. The power dissipation across each of them will determine which bulb will glow brighter. From the relation P=(I²) R, since current is same the power dissipation will be higher for the bulb with higher resistance i.e. 40W bulb.
Hence 40W bulb will glow brighter in series connection.
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