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Electric power =V^(2)//R....

Electric power `=V^(2)//R`.

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The correct Answer is:
TRUE
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Electric power =I^(2)R

Electrical Power

Knowledge Check

  • The dimensionally correct expression for the resistance R among the following is [P = electric power, l = electric current, t = time, V = volatge and E = electric energy]

    A
    `R=sqrt(Pl)`
    B
    `R=E/(l^(2)t)`
    C
    `R=V^(2)P`
    D
    R = Vl

  • The dimensionally correct expression for the resistance R among the following is [P= electric power, l= Electric current 1 = time, V = voltage and E=electric energy]

    A
    `R=sqrt(Pl)`
    B
    `R=E/(l^2t)`
    C
    `R=V^2P`
    D
    R=Vl

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

    A
    If both Assertion & Reason are true and the reason is the correct explanation of the assertion.
    B
    If both Assertion & Reason are true but the reason is not the correct explanation of the assertion.
    C
    If Assertion is true statement but Reason is false.
    D
    If both Assertion and Reason are false statements.

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    Write true of false: Electric prowe =I ^2 R . What is the unit of electric power?

    Define electric power.

    (a) Define Electric power. An electrial device of resistance R is connected across a source of voltage V and draws a current I. Derive an expression for power in terms of current and resistance. (b) Tow electric bulbs rated 100W , 220V and 60W, 220V are connected in parallel to an electric mains of 220V . Find the current draw by the bulbs form the mains.

    A bulb of 484 Omega is producing light when connected to 200 V supply. What is the electric power of the bulb?

    Two electric bulbs marked 40 W, 220 V and 60 W, 220 V when connected in series, across same voltage supply of 220 V, the effective power is P_(1) and when connected in parallel, the effective power is P_(2) . Then (P_(1))/(P_(2)) is

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