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College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300

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BuyFindarrow_forward

College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

If electrical power is transmitted over long distances, the resistance of the wires becomes significant. Why? Which mode of transmission would result in less energy loss: high current and low voltage or low current and high voltage? Discuss.

To determine
The role of resistance in transmitting power over long distances.

Explanation

The power loss is given by,

Ploss=I2R

  • I is the current.
  • R is the resistance.

The power loss is directly proportional to the resistance. In other words, the power loss per unit length depends on the resistance per unit length. Hence, the wires should have low resistance and resistivity

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