17_Ch 17 College Physics ProblemCH17 Current and Resistance

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

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Current and Resistance 85 17.39 The resistance per unit length of the cable is ( ) 2 5 2 2 2.00 W m 2.22 10 m 300 A I L R L L I = = = = × P P From R L A ρ = , the resistance per unit length is also given by R L A ρ = . Hence, the cross-sectional area is 2 r A R L ρ π = = , and the required radius is ( ) ( ) 8 -5 1.7 10 m 0.016 m 1.6 cm 2.22 10 m R L ρ π × Ω⋅ = = = = × r π 17.40 (a) The power input to the motor is ( ) ( )( ) 120 V 1.75 A 210 W 0.210 kW
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