- #1
flyingpig
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Homework Statement
A 100W lightbulb connected to a 120V source experiences a voltage surge that produces 140V for a moment. By what percentage does its power output increase? Assume its resistance does not change
The Attempt at a Solution
(1) [tex]P_0 = C\Delta V_0 ^2[/tex]
(2) [tex]P = C\Delta V^2[/tex]
Note that C is a constant (the resistance)
Divide (1) by (2)
[tex]\frac{P_0}{P} = (\frac{\Delta V_0}{\Delta V})^2[/tex]
Plugging the numbers I get 1.36111...
Multiply it by 100 I get 136.11%
Now, the book says 36.11%
Why...?