HW 3 Spring 2011

HW 3 Spring 2011 - mind that there are two wires each 250...

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Homework 3 - Spring 2011. A two-wire dc power distribution circuit supplies six 100 W lamps located 250 ft from a dc generator. The generator voltage is 120 V and the lamp voltage should be 110 V or more. Calculate the current drawn by each lamp if its voltage is 110 V and its power is 100 W. Calculate the current in the two-wire line. Calculate the maximum resistance of the two-wire line. Calculate the resistance per unit length (in ohms/1000 ft), keeping in
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Unformatted text preview: mind that there are two wires each 250 ft long. What size of copper wire is required (see table of wire resistance)? Hint: Sketch the circuit using wire resistance as R w . Assume the lamp voltage is 110 V, calculate the current to deliver 100 W to each lamp. Then calculate the line current I line . Ohms law and KVL will give equations that can be solved for R w ....
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This note was uploaded on 11/09/2011 for the course ELCT 220 taught by Professor Brice during the Spring '11 term at USC.

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