90CHAPTER 17 (b) The cost of operating the iron for 20 minutes is ()561 kWh8.610 J$0.080 kWh$0.0191.9 cents3.60costE rate=⋅=×==×17.51Ohm’s law gives the resistance as ( )RVI= ∆. From RLAρ=, the resistivity is given by ( )RAL. The results of these calculations for each of the three wires are summarized in the table below. ( )mL( )RΩ( )mΩ⋅0.540 10.4 61.4110−×1.028 21.1 61.5010−×1.543 31.8 61.5010−×The average value found for the resistivity is 6av1.47
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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.