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An LED, or light emiting diode, can have many functions. Commonly used as a solid state light emitter, LEDs of nearly any color of light are available, including ultraviolet and infrared.
A less obvious use of a light emitting diode is to detect light. A LED makes a very efficent and narrow band light detector. It will produce electric current in response to light that is about the same wavelength (and therefore color) as when it is used as an emitter.
Another use of an LED is to make a fairly stable voltage reference; A red LED when forward biased will have a steady voltage drop of about 1.8 volts, an orange LED produces a voltage drop of about 2.0 volts, and about 3.5 volts for blue and white emitting LEDs.
LEDs can be used as modulated light emitters to transmit speech, music and digital information. A good example is a television remote control which digitally pulses a infrared LED to change channels, control volume, and so on.
LEDs are used in solid state switches when optically coupled to a photodiode or photo resistor. LED flashlights are very common, and some small light bulb replacements are available, with larger bulb replacements soon to come. Some links are provided below:
Wiki User
∙ 11y ago
Wiki User
∙ 12y agoAn LED (light emitting diode) is used in electronic circuits to provide light where needed. Essentially, it is a low power lightbulb, which uses a gallium nitride/ indium phosphide P-N junctions to create light. They can be used in circuits to indicate that power is being supplied (the small light on your PC's motherboard). They have more practical uses too. High-power LED's are used as an alternative to light bulbs in some places, they are used as bicycle lights too.
Wiki User
∙ 7y agoThe LED has two leads: anode is positive and is the longer lead, cathode is negative. So, in a DC circuit, the positive goes to the anode.
Wiki User
∙ 14y agoLED stands for Light emitting Diode and are commonly used as small indicator lights in consumer electronics.
Wiki User
∙ 12y agoA Light Emitting Diode (LED) 'emits' or 'produces' light.
Wiki User
∙ 13y agoTo produce visible or infrared light when subjected to an electric current, as a result of electroluminescence.
prolux
Light Emitting Diode (LED) a semiconductor device that converts electricity into light.
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Can you use buzzer instead of led in a circuit?
Sure. If you want sound when the circuit is energized, use a buzzer. If you want a visual indication when the circuit is energized, use an LED.
What is the purpose of the diode in the GM AC clutch circuit?
The purpose of the diode is to prevent electricity to flow in the wrong direction in a circuit. The purpose of the diode is to prevent electricity to flow in the wrong direction in a circuit.
Difference between optocoupler and normal diode?
Purpose: An optocoupler (or optical isolator) uses optics to isolate one circuit from another. The diode in the optical isolator is similar to an LED. The light from this LED controls the gate or base of a transistor. A diode has two terminals, an optocouple will have at least 4. A diode is used to control current flow direction; an optocoupler main purpose is to isolate one circuit from another. etc. etc.
What is the purpose of LDR on a circuit?
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What does LED do in a circuit?
light up when forward biased
What is the purpose of the battery in the circuit?
The purpose of the battery in a circuit is to wive energy to the circuit
What is the purpose of the batteries in the circuit?
The purpose of the battery in a circuit is to wive energy to the circuit
Which component can replace the infrared LED in any electronics circuit?
If a circuit requires an IR LED, it requires an IR LED, there is no replacement. If a circuit does not require an IR LED, there is no need to look for a replacement.
What is the purpose of a voltmeter in a circuit?
the purpose of a voltmeter is used to measure voltage in a circuit
The purpose of the SEC's circuit breakers rule is to?
The purpose of the SEC's circuit breakers rule is to:
What does an led do in an electronic circuit?
the function of an led is to give of light coming through an electrical circuit
Can you use buzzer instead of led in a circuit?
Sure. If you want sound when the circuit is energized, use a buzzer. If you want a visual indication when the circuit is energized, use an LED.
What is the purpose of the diode in the GM AC clutch circuit?
The purpose of the diode is to prevent electricity to flow in the wrong direction in a circuit. The purpose of the diode is to prevent electricity to flow in the wrong direction in a circuit.
What is the purpose of placing a multiplexer at the end of a circuit?
Control circuit.
The 4017 integrated circuit is a type of what circuit?
led to 250 watts bulb
How to build an led cIRCUIT?
Connect an LED, two AA batteries, and a resistor of around 100-150 ohms, all in series.If the LED doesn't light, then turn either the LED or the batteries around in the circuit.
Difference between optocoupler and normal diode?
Purpose: An optocoupler (or optical isolator) uses optics to isolate one circuit from another. The diode in the optical isolator is similar to an LED. The light from this LED controls the gate or base of a transistor. A diode has two terminals, an optocouple will have at least 4. A diode is used to control current flow direction; an optocoupler main purpose is to isolate one circuit from another. etc. etc.
