Out of two electric bulbs of 50W - 220V and 100W - 220V.
Out of two electric bulbs of 50W - 220V and 100W - 220V. Which one will glow brighter when they are connected (i) in series, and (ii) in parallel?
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The resistance of the bulb is defined as R =V2/P So the resistance of 50W bulb is double than the resistance of 100W bulb. When they are connected in series the current through both bulbs is same. Hence 50-watt bulb will be brighter because P=I2R. In parallel, the voltage will be same in both bulbs. So, the 100-watt bulb will be brighter because of P=V2/R.
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