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प्रश्न
Draw the V-I characteristics of an LED. State two advantages of LED lamps over convertional incandescent lamps.
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
Meeta's father was driving her to school. At the traffic signal, she noticed that each traffic light was made of many tiny lights instead of a single bulb. When Meeta asked this question to her father, he explained the reason for this.
Answer the following questions based on above information:
(i) What were the values displayed by Meeta and her father?
(ii) What answer did Meeta's father give?
(iii) What are the tiny lights in traffic signals called and how do these operate?
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
Carbon, silicon and germanium have four valence electrons each. These are characterised by valence and conduction bands separated by energy band gap respectively equal to (Eg)C, (Eg)Si and (Eg)Ge. Which of the following statements is true?
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
Write briefly the important processes that occur during the formation of p−n junction. With the help of necessary diagrams, explain the term 'barrier potential'.
Draw the circuit diagram of an illuminated photodiode in reverse bias. How is photodiode used to measure light intensity?
Draw the circuit arrangement for studying the V-I characteristics of a p-n junction diode in reverse bias. Plot the V-I characteristics in this case.
Explain photodiode.
For LED's to emit light in visible region of electromagnetic light, it should have energy band gap in the range of:
If the resistance R1 is increased (Figure), how will the readings of the ammeter and voltmeter change?
