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In Physics / High School | 2014-07-08

How is the resistance of a 40V lamp higher than the resistance of a 60V lamp?

Asked by HansGarnet

Answer (2)

Power dissipation = (voltage across the component)² / (resistance of the component)
Since the resistance is in the denominator of the fraction in this formula for the quantity of power dissipated, you can see that when the supply voltage is constant, the smaller resistance dissipates more power.
So the 40w lamp has higher resistance than the 60w bulb.

Answered by AL2006 | 2024-06-10

The resistance of a lamp is determined by its power rating and voltage. A lower power and constant voltage result in higher resistance. Therefore, for given voltage levels, the lamp with lower wattage has higher resistance.
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Answered by AL2006 | 2024-12-24

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