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Question
Draw the V-I characteristics of an LED. State two advantages of LED lamps over convertional incandescent lamps.
Solution
Advantages of LED over incandescent lamps:
(i) LEDs do not have a filament that will burn out, so they last much longer.
(ii) LEDs output more lumens of light than regular incandescent bulbs.
(iii) LED has less power and low operating voltage
(iv)LED has fast action and required no warm-up time.
RELATED QUESTIONS
If a small voltage is applied to a p-n junction diode, how will the barrier potential be affected when it is (i) forward biased
If a small voltage is applied to a p-n junction diode, how will the barrier potential be affected when it is(ii) reveres biased?
A p-n photodiode is fabricated from a semiconductor with band gap of 2.8 eV. Can it detect a wavelength of 6000 nm?
The width of depletion region of p-n junction diode is _______.
(A) 0.5 nm to 1 nm
(B) 5 nm to 10 nm
(C) 50 nm to 500 nm
(D) 500 nm to 1000 nm
How does a light emitting diode (LED) work? Give two advantages of LED’s over the conventional incandescent lamps.
What happens to the width of depletion player of a p-n junction when it is (i) forward biased, (ii) reverse biased?
Explain how a potential barrier is developed in a p-n junction diode.
Answer the following question.
Draw solar cell V-I characteristics.
In Figure, assuming the diodes to be ideal ______.
Why a photo-diode is operated in reverse bias whereas the current in the forward bias is much larger than that in the reverse bias? Explain. Mention its two uses.
