Three bulbs of $40\, W , 60\, W$ and $100\, W$ are connected in series across the mains. Across which the potential difference is highest? Across which is lowest ?
Three bulbs of $40\, W , 60\, W$ and $100\, W$ are connected in series across the mains. Across which the potential difference is highest? Across which is lowest ?
In series, the current is same in all the three bulbs and so the potential difference across a bulb is proportional to its resistance. The resistance of lowest wattage bulb is highest in accordance with the relation $R \propto \frac{1}{ P } \cdot$ Therefore, potential difference is highest across the $40 W$ bulb and is lowest across the $100 W$ bulb.
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