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College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300

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BuyFindarrow_forward

College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

Two lightbulbs are each connected to a voltage of 120 V. One has a power of 25 W, the other 100 W. (a) Which lightbulb has the higher resistance? (b) Which lightbulb carries more current?

(a)

To determine
Whether the bulb with 25W or 100W have higher resistance.

Explanation

Given Info: Two bulbs with powers 25W and 100W are connected to a voltage of 120V .

Explanation:

Formula to calculate the resistance is,

R=V2P

  • R is the resistance of the bulb
  • V is the voltage applied to bulb
  • P is the power consumed by the bulb

Substitute 120V for V and 25W for P in the above equation to find R

(b)

To determine
Whether the bulb with 25W or 100W carries more current.

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