Problem 3- (a) Explain the pn-structure of a LED and its working principles, briefly . (b) Explain how a fluorescent lamp is working, briefly. (c) which lamp do you prefer and why? Explain briefly.
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A: Answer -
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A: To Explain the function of the application/circuit.
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A: Equation of Hole concentration is derived as shown below
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- help me in these questions pls write the questions with the and by (Computer)1- Explain how the circuit below works to perform its main function?i. Zener diode is short circuited when voltage across it rises beyond its breakdown voltage.ii. Radiation from light emitting diode is detected by a phototransistor without having any physical contact.iii. The circuit prevents the LED from having the wrong polarity or too high voltage.iv. The circuit prevents the alternating signals by rectifying it using a diode. a. All the answers. b. i, ii and iii only. c. i, iii and iv only. d. i, ii and iv only.========2- Which of the following statement is most probably INCORRECT in explaining the working principle of an engine management system? a. Microprocessor is used to process incoming signal including position, speed, timing, flow, and temperature. b. The operation of valves and spark ignition is in sequence following the stroke action. c. The timing of the sequence is fixed.…Do you understand the connection between a diode and an LED and semiconductors? Put the symbol and some background information on a graph?A. Explain the difference between charging current andfaradaic current. B. What is the purpose of waiting 1s after a voltage pulse before measuring current in sampled current voltammetry? C. Why is square wave voltammetry more sensitive than sampled current voltammetry?
- Do you know how a diode and an LED are related to semiconductors? Put the symbol on a graph, along with some context?An AC voltage controller with common cathode has O a. two diodes to be conducted at a time b. one SRC to be controller at a time O c. two SRC to be controller at a time O d. four diodes to be conducted at a timeWhat does the forward voltage drop for an LED depend on? Please choose one: a. all of the above b. color c. diode type D. forward current
- 1. Answer the following with "TRUE" or "FALSE" then explain why. ________a.) Charges choose the path of least resistance. Given a resistor in parallel with a diode, no current willflow through the resistor when the applied voltage exceeds the diode’s forward voltage.________b.) Since diodes are unidirectional components, it will always block AC signals e.g. pulse train,sawtooth, triangular signals.________c.) Silicon diodes typically have a forward voltage of 0.7V.If anode of each LED of the seven-segment display is connected to the 5-V supply the chip is a _____ display. It is an active-____, because it takes a _____ to illuminate a segment. A.common-anode, LOW, LOW B. common-cathode, LOW, LOW C. common-anode, HIGH, HIGH D. common-cathode, HIGH, HIGH E. common-anode, HIGH, LOWsolve all on the keyboard or will dislike if need draw on paper no problem (a) Explain the following terms as they relate to semiconductor diodes: Avalanche effect, Depletion region, and Intrinsic semiconductor (b) With the aid of fully labeled Crystal Lattice Structure diagram (s), explain how P-type material of a semiconductor is formed. (c) Draw a diagram showing the volt-ampere characteristic of a Zener diode. Explain the difference between Zener breakdown and Avalanche breakdown mechanisms. (d) A bridge rectifier is supplied with 120Vrms sinusoidal signal. If each diode has a junction voltage of 0.7V, determine: The peak voltage at the output of the rectifier and A suitable peak inverse voltage rating of each diode
- Q2//Answer Any Two 1. State the applications of Clamper.2- What are the disadvantages of LED? 3- Why Si & Ge are not used in LED? Q3/ Write in brief on Avalanche diode. Q4/Does Clamper circuit change the peak-to-peak (l.e., rms value)? Justfy Q5/ State the applications of the photodiode.The following are a number of statements about opto-electronic devices and materials. Some are TRUE and some are FALSE. i. You can make light emitting diodes from any direct band-gap semiconductor. ii. You can make a laser from silicon. iii. You can make a light emitting diode from GaAs. iv. Light emitting diodes work in reverse bias. v. Photodiodes often work in reverse bias. vi. A solar cell does not require an external bias voltage to work. Which of the following statements is TRUE: (v) and (vi) are TRUE (iv) and (v) are TRUE (iii) and (iv) are TRUE1. The reverse bias diodes a. D1 only b. D2 only c. Everything d. None 2. The close circuit is a. R1 and D1 side only b. R2 and D2 side only c. Everything d. None