Advertisements
Advertisements
Question
A semiconductor device is connected in series with a battery, an ammeter and a resistor. A current flows in the circuit. If. the polarity of the battery is reversed, the current in the circuit almost becomes zero. The device is a/an ______.
Options
intrinsic semiconductor
p-type semiconductor
n-type semiconductor
p-n junction diode
Advertisements
Solution
A semiconductor device is connected in series with a battery, an ammeter and a resistor. A current flows in the circuit. If. the polarity of the battery is reversed, the current in the circuit almost becomes zero. The device is a/an p-n junction diode.
Explanation:
When the battery's polarity is reversed, the p-n junction becomes reverse bias. As a result, its resistance rises and the current through the junction falls to nearly zero.
APPEARS IN
RELATED QUESTIONS
Explain the working of P-N junction diode in forward and reverse biased mode.
Plot a graph showing variation of current versus voltage for the material GaAs ?
The plate current in a diode is 20 mA when the plate voltage is 50 V or 60 V. What will be the current if the plate voltage is 70 V?
In semiconductor physics, what is meant by:
(i) rectifier
(ii) an amplifier
(iii) an oscillator
Diffusion in a p-n junction is due to ______.
The drift current in a p-n junction is from the ______.
The nature of binding for a crystal with alternate and evenly spaced positive and negatively ions is
Consider an npn transistor with its base-emitter junction forward biased and collector base junction reverse biased. Which of the following statements are true?
- Electrons crossover from emitter to collector.
- Holes move from base to collector.
- Electrons move from emitter to base.
- Electrons from emitter move out of base without going to the collector.
Figure shows the transfer characteristics of a base biased CE transistor. Which of the following statements are true?
At Vi = 0.4 V, transistor is in active state.
At Vi = 1 V, it can be used as an amplifier.
At Vi = 0.5 V, it can be used as a switch turned off.
At Vi = 2.5 V, it can be used as a switch turned on.
Describe the following term briefly:
minority carrier injection in forward biasing.
