Two electric bulbs $A$ and $B$ are marked $220\, V, 60 \,W$ and $220\, V , 100\, W$ respectively. Which one of the two has greater resistance ?
Two electric bulbs $A$ and $B$ are marked $220\, V, 60 \,W$ and $220\, V , 100\, W$ respectively. Which one of the two has greater resistance ?
The resistance of a bulb is given by the expression $R =\frac{ V ^{2}}{ P } .$ For the same voltage, the bulb having a smaller power has more resistance. Therefore, the $60 \,W , 220\, V$ bulb has a greater resistance.
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