P27_062 - 1 a decrease in R will result in an increase in P...

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62. (a) We use P = V 2 /R V 2 ,wh ichg iv e s∆ P V 2 2 V V . The percentage change is roughly P/P =2∆ V/V = 2(110 115) / 115 = 8 . 6% . (b) A drop in V causes a drop in P , which in turn lowers the temperature of the resistor in the coil. At a lower temperature R is also decreased. Since
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Unformatted text preview: 1 a decrease in R will result in an increase in P , which partially oFsets the decrease in P due to the drop in V . Thus, the actual drop in P will be smaller when the temperature dependency of the resistance is taken into consideration....
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This note was uploaded on 11/12/2011 for the course PHYS 2001 taught by Professor Sprunger during the Fall '08 term at LSU.

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