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Three bulbs of ratings 40W,60W and 100W are designed to work on 220V mains.Which bulb will glow most bright if they are connected in series across the 220V mains? |
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Answer» Resistance of BULB is inversely proportional to its rated POWER, at same voltage because P=(V*V)/R Therefore R (40W bulb) > R (60W bulb) > R (100W bulb). Hence the bulb ACROSS which power dissipation is more will glow brighter. So in a series of connection, current flowing across each element in the circuit. So when 40W, 60W and 100W are designed to work on 220V mains in a series, the power dissipation across each of them will be determined according to the luminous capacity of the bulb. So 40W bulb will BLOW brighter in this series of connection. |
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