Question
What is the approximate forward threshold voltage of a silicon junction diode?
Answer Options
- A) 0.1 volt
- B) 0.3 volts
- C) 0.7 volts
- D) 1.0 volts
Correct Answer: C
Explanation
The forward threshold voltage (or turn-on voltage) of a diode is dependent on the semiconductor material. Silicon is the most common material used for general-purpose diodes and rectifier applications due to its high temperature tolerance and high breakdown voltage.
Silicon diodes have a higher forward threshold voltage than germanium diodes, typically around 0.7 volts. This means the voltage drop across a silicon diode in a forward-biased circuit will be approximately 0.7 \text{ V}, a fact that must be accounted for in power supply and circuit design.
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