1) why do transmission lines use high voltages instead of lower voltages to tran
ID: 1846373 • Letter: 1
Question
1) why do transmission lines use high voltages instead of lower voltages to transmit power?
2) If two cables have the same dimensions and one is aluminum and one is copper, which would have less resistance. Why?
3) From the information in problem #2, which cable could carry more current? Why?
4) When calculating Imax, why do you use the area of a single strand times the number of strands instead of measuring the outside diameter of the metal part of the cable and calculating area from that outer diameter?
(Hint: Draw a diagram of the cross section a cable with 7 individual strands and a diagram of a single large solid cable.)
5) Name one advantage of using high tension cables made of smaller individual wire strands.
6) Assume electric car designs and manufacturing suddenly became very successful. What implications would that success have for the current electric grid and home power delivery system?
Explanation / Answer
1. Higher voltage means lower current for the same power transmitted... lower current means smaller wires are required. Smaller wires means less cost to fabricate the transmission lines. Less cost means more profit for the electric companies (or lower bills for the customers).
2. copper. Resistivity is less
3 V=IR since V is constant so current is inversely propotional to resistance hence copper.
4.
5.Wire rope systems cost one-tenth as much and had lower friction losses than line shafts. Because of these advantages, wire rope systems were used to transmit power for a distance of a few miles or kilometers
6. they can store energy and can provide energy whenever needed. Audi is an example.
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