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Write the reason why do we preferred an ...

Write the reason why do we preferred an a.c. voltage instead of d.c. voltage.

Text Solution

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DC signals ( current or voltage) do not change direction with time. They are unidirectional ( current or voltage ) signal.
If the voltage obtained from source varies like a sine function with time then such a voltage is called alternating voltage (ac voltage).
Voltage-common used means potential difference between two points.
The current driven by in a circuit by ac voltage is called the alternating current ( ac current ).
The most of the electrical energy sold by power companies is transmitted and distributed as alternating current. The main reason for preferring use of ac voltage over dc voltage.
ac voltages can be easily and efficiently converted from one voltage to the other by means of transformers.
Electric energy can also be transmitted economically over long distances.
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Knowledge Check

  • If E_0 represents the peak value of the voltage in an a.c. circuit, the rms value of the voltage will be ......

    A
    `E_0/pi`
    B
    `E_0/2`
    C
    `E_0/sqrtpi`
    D
    `E_0/sqrt2`

  • Which device is used to increase or decrease A.C. voltage ?

    A
    Oscillator
    B
    Voltmeter
    C
    Transformer
    D
    Rectifier

  • …….. does not change with time for D.C. current and D.C. voltage.

    A
    only current
    B
    only voltage
    C
    only power
    D
    current, voltage and power

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