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  • Electrical energy is transmitted over large distances at high alternating voltages. Which of the following statements is (are) correct? A. For a given power level, there is a lower current.

Electrical energy is transmitted over large distances at high alternating voltages. Which of the following statements is (are) correct?
A. For a given power level, there is a lower current.
B. Lower current implies less power loss.
C. Transmission lines can be made thinner.
D. It is easy to reduce the voltage at the receiving end using step-down transformers.

Answers (1)

Since the power is to be transmitted over the large distances at high alternating voltages, the current flowing through the wires will below.
The power loss due to transmission lines with resistance R and current

I_{rms} in the circuit is given by I_{rms}^{2}R
P=E_{rms}I_{rms}(I_{rms}is \: low\: when\: E_{rms}\: is\: high)

Power\:loss=I_{rms}^{2}R=low

The voltage at the receiving end is reduced by step-down transformers.

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infoexpert21

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