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Electrical energy is transmitted over la...

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

Text Solution

Verified by Experts

The correct Answer is:
1,2,4
According to relation, `P = EI` when `I` is low, powe loss `(= I^(2) R)` is also low. A step down transformer lowers voltage by increasing current.
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Knowledge Check

  • Which one of the following statements about energy is correct?

    A
    Energy can be created as well as destroyed.
    B
    Energy can be created but not destroyed.
    C
    Energy can neither be created nor destroyed.
    D
    Energy cannot be created but can be destroyed.

  • For the energy levels in an ato which one of the following statements is/are correct?

    A
    There are seven principal electron energy levels.
    B
    The second principal energy level can have 4 subnergy levels and contain a maximum of 8 electrons.
    C
    The M energy level can have a maximum of 32 electrons.
    D
    The 4s subenergy level is at a lower energy than the 3d subenergy level.

  • For the energy levels in atom, which one of the following statement (s) is (are) correct?

    A
    For Ca (Z = 20) energy of the 4s-subshell is less than 3d-subshell
    B
    For Zn (Z = 30) energy of 3d-subshell is less than 4s-subshell
    C
    For Ca (Z = 20) energy of the 4s-subshell is more than 3d-subshell
    D
    For Zn (Z = 30) energy of 3d-subshell is more than 4s-subshell

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