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PHY 102 Test Compilation PHY 102 15 Objective Question
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Question

Why is electrical energy usually transmitted at high voltage?
Options
A the resistance of the transmission cables is as small as possible
B the transmission cables are safer to handle
C as little energy as possible is wasted in the transmission cables
Correct Answer
D the transmission system does not require transformers
Correct Answer

Option C is the correct answer.

Detailed Explanation

Power loss during transmission is primarily due to the resistance of the cables and is given by Ploss = I²R. For a given amount of power (P) to be transmitted, P = VI, so current I = P/V. By transmitting at high voltage (V), the current (I) is reduced. This reduction in current significantly decreases the power loss (I²R) in the transmission cables, making the transmission more efficient.

Hint

Consider the relationship between power loss, current, and voltage in electrical transmission lines.

Question Info

Course: PHY 102
Topic: Test Compilation PHY 102 15
Type: Objective
Difficulty: Not specified
Question 1028 of 1819
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