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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
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?
Using the necessary circuit diagrams, show how the V-I characteristics of a p-n junction are obtained in
Reverse biasing
How are these characteristics made use of in rectification?
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
Name the device which converts the change in intensity of illumination to change in electric current flowing through it. Plot I-V characteristics of this device for different intensities. State any two applications of this device.
In Figure, assuming the diodes to be ideal ______.
The amplifiers X, Y and Z are connected in series. If the voltage gains of X, Y and Z are 10, 20 and 30, respectively and the input signal is 1 mV peak value, then what is the output signal voltage (peak value)
- if dc supply voltage is 10V?
- if dc supply voltage is 5V?
Draw solar cells of I-V characteristics.
Draw the circuit diagram of an illuminated photodiode and its I-V characteristics.
What energy conversion takes place in a solar cell?
