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

1017973_72c215d5eeb44030bc1d3e2504f88eaf.png

A
1.5 Ω
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B
5 Ω
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C
6.67 Ω
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D
200 Ω
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Solution

The correct option is A 5 Ω
Voltage drop across diode, VD=0.5V

Maximum power rating of diode, P=100mW=100×103W

Source voltage, Vs=1.5V

The resistance of diode,

RD=V2PP=0.52100×103=2.5Ω

And

Current in diode,

ID=VDRD=0.52.5=0.2Ω

Therefore, Total resistance in circuit,

R=VsID=1.50.2=7.5Ω

And,

Value of series resistor = Total resistance of the circuit Resistance of diode

=7.52.5=5Ω

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