To use a transistor as an amplifier
Correct answer: A. the emitter base junction is forward biased and the collector base junction is reverse biased
- A. the emitter base junction is forward biased and the collector base junction is reverse biased
- B. no bias voltage is required
- C. both junctions are forward biased
- D. both junctions are reverse biased
Explanation
To use a transistor as an amplifier, the emitter-base junction is forward biased, allowing the injection of carriers from the emitter to the base. The collector-base junction is reverse biased to create a high-resistance path for the majority charge carriers from the base to the collector.Incorrect Options and Explanations: (b) no bias voltage is required - Bias voltage is essential to control the transistor's operation and to establish the desired operating point. (c) both junctions are forward biased - This configuration would not allow proper transistor operation. (d) both junctions are reverse biased - This configuration does not enable the transistor to function as an amplifier effectively.
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About Electronics
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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