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JEE Main & Advanced Physics Semiconducting Devices Question Bank Critical Thinking

  • question_answer
    The diode used in the circuit shown in the figure has a constant voltage drop of 0.5 V at all currents and a maximum power rating of 100 milliwatts. What should be the value of the resistor R, connected in series with the diode for obtaining maximum current                          [CBSE PMT 1997]

    A)            1.5 W

    B)            5 W

    C)            6.67 W

    D)            200 W

    Correct Answer: B

    Solution :

                       The current through circuit \[i=\frac{P}{V}=\frac{100\times {{10}^{-3}}}{0.5}=0.2A\]                    \ voltage drop across resistance = 1.5 ? 0.5 = 1 V                      Þ \[R=\frac{1}{0.2}=5\,\Omega \].


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