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9 February, 12:16

A computer is connected across a 110 V power supply. The computer dissipates 123 W of power in the form of electromagnetic radiation and heat. Calculate the resistance of the computer.

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Answers (2)
  1. 9 February, 14:04
    0
    81.3ohms

    Explanation:

    Resistance is known to provide opposition to the flow of electric current in an electric circuit.

    Power dissipated by the computer is expressed as;

    Power = current (I) * Voltage (V)

    P = IV ... (1)

    Note that from ohms law, V = IR

    I = V/R ... (2)

    Substituting equation 2 into 1, we will have;

    P = (V/R) * V

    P = V²/R ... (3)

    Given source voltage = 100V, Power dissipated = 123W

    To get resistance R of the computer, we will substitute the given value into equation 3 to have

    123 = 100²/R

    R = 100²/123

    R = 10,000/123

    R = 81.3ohms

    The resistance of the computer is 81.3ohms
  2. 9 February, 15:56
    0
    98.37 ohms.

    Explanation:

    Power, P = I * V

    Using ohms law,

    V = I * R

    P = V^2/R

    Given:

    V = 110 V

    P = 123 W

    R = 110^2/123

    = 98.37 ohms.
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