Physics-
General
Easy

Question

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 mW. What should be the value of the resistor R, connected in series with the diode for obtaining maximum current?

  1. 1.5 blank capital omega    
  2. 5 blank capital omega    
  3. 6.67 blank capital omega    
  4. 200 blank capital omega    

The correct answer is: 5 blank capital omega


    Current through circuit,
    I equals fraction numerator P over denominator V end fraction equals fraction numerator 100 cross times 10 to the power of negative 3 end exponent over denominator 0.5 end fraction equals 0.2 blank A.
    Voltage drop across R equals 1.5 minus 0.5 equals 1.0 blank V
    Hence, R equals 1 divided by 0.2 equals 5 capital omega.

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