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?
Correct answer: B. 5 Ω
- A. 1.5 Ω
- B. 5 Ω
- C. 6.67 Ω
- D. 200 Ω
Explanation
Given:Voltage source = V = 1.5VVoltage drop across diode = Vd = 0.05Maximum power rating = Pmax = 100 mW = 0.1 WAccording to P = Vd x I maxI = P / Vd = 0.1 / 0.5 = 0.2ANow applying KVLV = IR + Vd1.5 = 0.2R + 0.51.5 - 0.5 = 0.2 RR = 1 / 0.2 = 5Ω.
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A p-n junction forms when p-type and n-type semiconductor regions meet, creating a depletion layer, barrier potential and rectifying action. The work covers forward and reverse bias, junction current, diode characteristics, and how a diode converts alternating current into pulsating direct current through half-wave and full-wave rectification.
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