22_Ch 17 College Physics ProblemCH17 Current and Resistance

22_Ch 17 College Physics ProblemCH17 Current and Resistance...

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90 CHAPTER 17 (b) The cost of operating the iron for 20 minutes is () 5 6 1 kWh 8.6 10 J $0.080 kWh $0.019 1.9 cents 3.60 cost E rate =⋅   = =   ×   17.51 Ohm’s law gives the resistance as ( ) RV I = ∆ . From RL A ρ = , the resistivity is given by ( ) RA L . The results of these calculations for each of the three wires are summarized in the table below. ( ) m L ( ) R ( ) m Ω⋅ 0.540 10.4 6 1.41 10 × 1.028 21.1 6 1.50 10 × 1.543 31.8 6 1.50 10 × The average value found for the resistivity is 6 av 1.47
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This note was uploaded on 12/09/2011 for the course PHYS 2020 taught by Professor Staff during the Fall '10 term at FIU.

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