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50. GaAs and AlGaAs2 are examples of a. light-emitting diode (LED) b. sound-emitting c. np semiconductors....
5. A light emitting diode (LED) is a diode that lights up when a current flows across it. The symbol for an LED is shown below (sometimes wiggly arrows are used to represent the light instead.) For this question we will assume we are working with LEDs that have a turn-on voltage of VoN-1V and a reverse breakdown voltage of VBR-8V a. You hook up a single LED to a power supply that can put out vol tage from -10...
Diodes can emit light. a) In a light emitting diode, what must be done electrically to cause the diode to emit light? How is the light emitted? b) What feature of the band gap is needed to make the LED emit light without much energy going into heat? c) Is the light from an LED produced primarily by spontaneous emission or stimulated emission? d) What feature of the LED determines the color of the light? e) What addition to an...
7. Diodes can emit light. a) In a light emitting diode, what must be done electrically to cause the diode to emit light? How is the light emitted? b) What feature of the band gap is needed to make the LED emit light without much energy going into heat? c) Is the light from an LED produced primarily by spontaneous emission or stimulated emission? d) What feature of the LED determines the color of the light? e) What addition to...
3. A light emitting diode (LED) connected to a 3V power supply emits 440nm blue light. The current in the LED is 10 mA, and the LED is 60% efficient at converting electric power input into light power output. How many photons per second does the LED emit?
A light-emitting diode (LED) connected to a 3.0 V power supply emits 440 nm blue light. The current in the LED is 11 mA , and the LED is 71 % efficient at converting electric power input into light power output. A) How many photons per second does the LED emit?
Research the specification sheet for bright blue light emitting diode (LED). Find the nominal forward voltage (Vf) and forward current (If) from the sheet. Next, connect the LED to 12 volt DC power supply and a resistor in series. You must determine the resistance of the resistor to limit the current to the value found in the specification sheet. Explain what you found and how you calculate the resistance for this circuit
An individual white LED (light-emitting diode) has anefficiency of 20% and uses 1.0 W of electric power. a) How many LEDs must be combined into one light sourceto give a total of 1.6 W of visible-light output (comparableto the light output of a 40 W incandescent bulb)? b) What total power is necessary to run this LED lightsource?
6. The following LED (Light Emitting Diode) circuit has NMOS transistors with a Vto = 1V, and the assigned gate-source voltages (Vgs). Determine the current flowing through each LED (D1, D2, and D3). Next, determine the power dissipated in each resistor. Note: The diodes have a forward voltage (V+) drop of D1 = 1.9V, D2 = 2.2V, and D3 = 2.5V, and have a reverse voltage (V.) of D1 = 12V, D2 = 10V, and D3 = 4V. (15 points)...
6) The adjacent graph shows the current-voltage characteristics for a Light Emitting Diode. a. Estimate the wavelength of the light it produces. b. Estimate the energy per photon in eV. Red LED 1.8 1.6 14 1.2 y=5.9228x + 1.6872 0.8 0.6 0.4 0.2 0.01 0.02 0.03 Current (A)
Part-1 wire the circuit as shown in the following figure withR, 4700 and light emitting diode (LED) V, should be applied using Channel-3 of DC Power Supply V1 LE.D. Figure 1 Tablel. LED Measurements VI Voltage Across LED Voltage across resistor LED State On/Off (Volt) Vian (Volt) ofc 0.5 OCE