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प्रश्न
Draw the V-I characteristics of an LED. State two advantages of LED lamps over convertional incandescent lamps.
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उत्तर
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.
संबंधित प्रश्न
Colour of light emitted by LED depends upon__________________ .
- its forward bias
- its reverse bias
- the band gap of the material of semiconductor
- its size
A p-n photodiode is fabricated from a semiconductor with band gap of 2.8 eV. Can it detect a wavelength of 6000 nm?
Show the output waveforms (Y) for the following inputs A and B of (i) OR gate (ii) NAND gate ?
The plate resistance of a triode is 8 kΩ and the transconductance is 2.5 millimho. (a) If the plate voltage is increased by 48 V and the grid voltage is kept constant, what will be the increase in the plate current? (b) With plate voltage kept constant at this increased value, by how much should the grid voltage be decreased in order to bring the plate current back to its initial value?
What is a solar cell?
Draw solar cells of I-V characteristics.
Draw the circuit diagram of an illuminated photodiode and its I-V characteristics.
How can a photodiode be used to measure light intensity?
Select the wrong statement in the case of LED.
- For a solar-cell the I-V characteristics lies in the (IV) quadrant of the given graph.
- In a reverse biased p-n junction diode, the current measured in (μA), is due to majority charge carriers.
