- #1
briteliner
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Homework Statement
a wire of resistance r is drawn to double its length. assume a constant voltage and a fixed volume, by how much does the power dissipation change?
Homework Equations
P=LEI
E=V/L
I=V/R
The Attempt at a Solution
so when i plug in 2L for L, it just ends up canceling anyway. the answer in the back of the book says it should decrease by 3/4, so i don't understand how that would happen