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PN Junctions
19 questions By Tony R. Kuphaldt
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Question 10 of 19
Is this diode forward-biased or reverse biased?
Reveal answerThis diode is reverse-biased.
Notes:Nothing much to comment on here!
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Question 11 of 19
Insert a diode into this circuit schematic in the correct direction to make it forward-biased by the battery voltage:
Reveal answer
Notes:Nothing much to comment on here!
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Question 12 of 19
Most introductory textbooks will tell you that a silicon PN junction drops 0.7 volts when forward-biased, and a germanium PN junction drops 0.3 volts when forward biased. Design a circuit that tests the “forward voltage” (VF) of a PN-junction diode, so you may measure the voltage yourself, without the use of a special diode-testing meter.
Reveal answer
Notes:Ask your students how they would determine the size of resistor to use for this “diode test” circuit. Would be permissible to use any arbitrary value of resistor, or does the value matter significantly?
