20_Chapter 16 HomeworkCH17 Current and Resistance

20_Chapter 16 HomeworkCH17 Current and Resistance - 88...

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88 CHAPTER 17 Thus, () 28 any combination of length and diameter satisfying the relation 4.8 10 m d l 1.0 m = l will be suitable. A typical combination might be and 82 4 4.8 10 m 2.2 10 m 0.22 mm d −− = × = Yes 3 cm () ( ) , such heating elements could easily be made from less than 0.5 of Nichrome. The volume of material required for the typical wire given above is 63 2 24 7 3 3 10 cm 2.2 10 m 1.0 m 1.5 10 m 0.15 cm 1 m VA d ππ  == = × = × =   ll 3 17.47 The energy that must be added to the water is 6 J1 k W h 200 kg 4 186 80 C 15 C 15 kWh kg C 3.60 10 J Em cT =∆ = ° ° = ⋅° × and the cost is ( ) 15 kWh $0.080 kWh $1.2 t E rate
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