Question

Constants A copper transmission cable 140 km long and 10.0 cm in diameter carries a current of 125 A. You may want to review (Pages 826 - 832). For related problemsolving tips and strategies, you may want to view a Video Tutor Solution of A source in an open circuit. All attempts used; correct answer displayed IDENTIFY: Use R = to calculate R and then apply V = IR. SET UP: For copper, p = 1.72 x 10-8 -m. A = ar”, where r = 5.00 x 10-2 m. EXECUTE: R COUTE, L =4.72 (1.72 x 101 m)(140 x 109 m) m =0.307 2. V = IR = (125 A)(0.307 12) = 38.3 V. (5.00x 10-m) Part B How much electrical energy is dissipated as thermal energy every hour? IVAL O ? AE - 16845187.5 Submit Previous Answers Request Answer X Incorrect; Try Again; 2 attempts remaining

Answer 1

H = Energy = I’Rt. = (125)*x(36005) (0.30732) = 17,268,750 Joule (Aus)