ECE 201 Lecture Notes - Lecture 2: Heating Element, Joule, Voltage Source
20 Nov 2017
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A resistor of length consists of a hollow cylinder of radius a surrounded by a layer of carbon that extends from r = a to r = b, as shown in fig. 2. 1: develop an expression for the resistance r, calculate r at 20 c for a = 1 cm, b = 2 cm, and = 10 cm. A 110-v heating element in a stove can boil a standard-size pot of water in 1. 2 minutes, consuming a total of 136 kj of energy. Determine the resistance of the heating element and the current flowing through it. 2. 4 a high-voltage direct-current generating station delivers 10 mw of power at 250 kv to a city, as depicted in fig. The city is represented by resistance rl and each of the two wires of the transmission line between the generating station and the city is represented by resistance rtl.
