1. A power transmission line is hung from metal towers with glass insulators having a resistance of 2.55 ✕ 109 Ω. What current (in mA) flows through the insulator if the voltage is 280 kV? (Some high-voltage lines are DC.)
2. A charge of 6.50 C passes through a pocket calculator's solar cells in 2.00 h. What is the power output (in W), given the calculator's voltage output is 4.50 V?
1. A power transmission line is hung from metal towers with glass insulators having a resistance...
(1) A large lightning bolt had a 20,500 A current and moved 32.5 C of charge. What was its duration (in ms)? (2) A power transmission line is hung from metal towers with glass insulators having a resistance of 2.55 ✕ 109 Ω. What current (in mA) flows through the insulator if the voltage is 280 kV? (Some high-voltage lines are DC.)
A 250 kV power transmission line carrying 5.00 ✕ 102 A is hung from grounded metal towers by ceramic insulators, each having a 2.00 ✕ 109 Ω resistance. (a) What is the resistance to ground in ohms of 145 of these insulators? (Assume the insulators are connected in parallel.) Ω (b) Calculate the power in watts dissipated by 145 of them. W (c) What fraction of the power carried by the line is this? P Ptot =