Flashcards on LED and calculating the series resistor
LED and Calculating the Series Resistor: A Comprehensive Guide
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Light-Emitting Diodes (LEDs)
21 cards
Card 1
Question: What is an LED?
Answer: A Light-Emitting Diode (LED) is a semiconductor device that emits light when an electric current flows through it, a phenomenon called electroluminesc
Card 2
Question: What is electroluminescence?
Answer: Electroluminescence is the phenomenon where a semiconductor device emits light when an electric current flows through it.
Card 3
Question: What are some general characteristics of LEDs?
Answer: LEDs are highly efficient, durable, and have a long lifespan compared to traditional incandescent bulbs.
Card 4
Question: What is an LED at its core?
Answer: At its core, an LED is a specialized type of diode, an electronic component that allows current to flow primarily in one direction.
Card 5
Question: What is an LED composed of?
Answer: An LED consists of a p-n junction, formed by joining two different types of semiconductor materials: a p-type (positive) material with an excess of 'h
Card 6
Question: How does an LED emit light?
Answer: When a sufficient voltage is applied across the LED in the correct direction (forward bias), electrons from the n-type material recombine with holes i
Card 7
Question: What determines the color of light emitted by an LED?
Answer: The color of the emitted light depends on the energy band gap of the semiconductor material used, which dictates the energy of the photons produced.
Card 8
Question: What is Forward Voltage (U_F) in an LED?
Answer: Forward Voltage (U_F) is the voltage drop across the LED when it is conducting current and emitting light. It is a characteristic voltage that must be
Card 9
Question: What factor influences an LED's Forward Voltage?
Answer: The forward voltage is largely dependent on the color of the LED, as different colors correspond to different semiconductor materials and band gap ene
Card 10
Question: What is the typical Forward Voltage for a red LED?
Answer: A red LED typically has a forward voltage of about 1.8 V to 2.2 V.