Why is electrical energy usually transmitted at high voltage?*1 pointAs little energy as possible is wasted in the transmission cables.The current in the transmission cables is as large as possible.The resistance of the transmission cables is as small as possible.The transmission system does not require transformer
Question
Why is electrical energy usually transmitted at high voltage?*1 pointAs little energy as possible is wasted in the transmission cables.The current in the transmission cables is as large as possible.The resistance of the transmission cables is as small as possible.The transmission system does not require transformer
Solution
Electrical energy is usually transmitted at high voltage to minimize energy loss during transmission. This is based on the principle of Ohm's law, which states that power loss (or energy loss) in a conductor is directly proportional to the square of the current flowing through it (P=I^2R, where P is power, I is current, and R is resistance).
By increasing the voltage, the current required to transmit the same amount of power is reduced (since P=VI, where V is voltage). This reduction in current subsequently reduces the power loss in the transmission cables.
Therefore, the statement "As little energy as possible is wasted in the transmission cables" is the correct answer.
The other options are not correct because:
- The current in the transmission cables is not as large as possible. In fact, it's the opposite. We want to minimize the current to reduce power loss.
- The resistance of the transmission cables is not as small as possible. While a smaller resistance would reduce power loss, the resistance of a cable is a physical property that can't be easily changed.
- The transmission system does require transformers. Transformers are used to step up the voltage for transmission and step down the voltage for use.
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The higher the voltage supplied to a circuit:the bigger the "push" received by electronsthe lower the currentthe higher the resistancethe less energy is us
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