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In Physics / High School | 2014-07-27

Which will have more resistance: a 220V, 100W bulb or a 220V, 60W bulb?

Asked by IsidroSophy693

Answer (2)

The power dissipated by something with voltage across it is
(voltage)² / (resistance) .
You can see that resistance is in the denominator of the fraction, so larger resistances dissipate less power, and smaller resistances dissipate more power.
Here's an easy way to remember it: -- Connecting a piece of rubber (high resistance) across the terminals of a battery uses very little power from the battery. -- Laying a piece of wire (low resistance) across the terminals of a battery may draw so much power from the battery that the wire melts.
Since the voltage across both bulbs is expected to be the same, the bulb designed to dissipate 60 watts has higher resistance than the one designed to dissipate 100 watts.

Answered by AL2006 | 2024-06-10

The 60W bulb has more resistance than the 100W bulb. Using the equation R = P V 2 ​ , the resistance of the 60W bulb is approximately 806.67 ohms, while that of the 100W bulb is 484 ohms. This means the 60W bulb has a higher resistance at the same voltage of 220V.
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Answered by AL2006 | 2024-12-24

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