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Physics

11th -

12thgrade

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Power in Circuits

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Neil Lithgo

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8 questions

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  • 1. Multiple Choice
    2 minutes
    1 pt

    A resistor of resistance R is connected to a fully charged cell of negligible internal resistance. A constant power P is dissipated in the resistor. An identical cell is connected in series with two identical resistors each of resistance R.

    What is the power dissipated in each resistor?

    PP

    P2\frac{P}{2}

    P4\frac{P}{4}

    P8\frac{P}{8}

  • 2. Multiple Choice
    2 minutes
    1 pt

    A wire of length L is used in an electric heater. When the potential difference across the wire is 200 V, the power dissipated in the wire is 1000 W. The same potential difference is applied across a second similar wire of length 2L. What is the power dissipated in the second wire?

    250 W

    500 W

    1000 W

    2000 W

  • 3. Multiple Choice
    2 minutes
    1 pt
    Image

    What power is dissipated in one of the 2Ω resistors?

    4 W

    2 W

    1 W

    0.5 W

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