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Electric power is transmitted over long ...

Electric power is transmitted over long distances through conducting wires at high voltage because

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(i) `P prop i^(2)`
(ii) Heat energy `prop i`
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When the electric power is transmitted over a long distance, it is beneficial to have it in ............ current.

a.c. power is transmitted over long distances at voltages so that power loss during transmission is ………

Knowledge Check

  • 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 less.
    C
    Transmission lines can be made thinner.
    D
    It is easy reduce the voltage at the receving end using step-down transformers

  • An audio signal of 15 kHz frequency cannot be transmitted over long distance without modulation because.

    A
    the size of the required anteena would be at least 5 km which is not convenient.
    B
    the audio signal cannot be transmitted through sky waves.
    C
    the size of the required antenna would be at least 20 km, which is not convenient.
    D
    effective power transmitted would be very low, if the size of the antenna is less than 5 km

  • Copper is not used for long distance lighting wires because

    A
    1.Copper is a poor conductor of heat
    B
    2.Copper is not a very good conductor of heat and electricity
    C
    3.Copper melts at high temperature
    D
    4.Copper wires would cost very high

    • Similar Questions

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    A: Electrical power through transmission lines is transmitted at high voltage. R: At high voltage theft of power is checked.

    A : AC can be transmitted over long distances at high voltage without much power loss. R : The average value of AC is defined over any half cycle.

    Figure : Long distance power transmissions The large-scale transmission and distribution of electrical energy over long distances is done with the use of transformers. The voltage output of the generator is stepped-up. It is then transmitted over long distances to an area sub station near the consumers. There the voltage is stepped down. It is further stepped down at distributing sub-stations and utility poles before a power supply of 240 V reaches our homes. We need to step-up the voltage for power. transmission, so that:

    Figure : Long distance power transmissions The large-scale transmission and distribution of electrical energy over long distances is done with the use of transformers. The voltage output of the generator is stepped-up. It is then transmitted over long distances to an area sub station near the consumers. There the voltage is stepped down. It is further stepped down at distributing sub-stations and utility poles before a power supply of 240 V reaches our homes. If the secondary coil has a greater number of turns than the primary,

    Figure : Long distance power transmissions The large-scale transmission and distribution of electrical energy over long distances is done with the use of transformers. The voltage output of the generator is stepped-up. It is then transmitted over long distances to an area sub station near the consumers. There the voltage is stepped down. It is further stepped down at distributing sub-stations and utility poles before a power supply of 240 V reaches our homes. Which of the following statement is true?

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