Based on the table, if the temperature changes from 25°C to 65°C in a 105-m section of
Question:
A. 0.04 Ω
B. 0.4 Ω
C. 4.0 Ω
D. 40 Ω
Electric power is generally transmitted to consumers by overhead wires. To reduce power loss due to heat, utility companies strive to reduce the magnitudes of both the current (I) through the wires and the resistance (R) of the wires. A reduction in R requires the use of highly conductive materials and large wires. The size of wires is limited by the cost of materials and weight. The table lists the resistances and masses of 1000-m sections of copper wires of different diameters at two different temperatures.
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Related Book For
Physics
ISBN: 978-0077339685
2nd edition
Authors: Alan Giambattista, Betty Richardson, Robert Richardson
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