7. A yellow colored LED with a forward voltage drop of 2.1V is to be connected to a 5.0V stabilized DC power supply. Calculate the value of the series resistor required to limit the forward current to less than 10mA. Also calculate the current flowing through the diode if a 1002 series resistor is used instead of the calculated first.

Electric Motor Control
10th Edition
ISBN:9781133702818
Author:Herman
Publisher:Herman
Chapter59: Motor Startup And Troubleshooting Basics
Section: Chapter Questions
Problem 12SQ: How is a solid-state diode tested? Explain.
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3. Discussion
1. Plot the forward characteristics of each LED on the same graph.
2. From the sketched curves, determine the threshold voltage for each LED. Determine also
the forward static resistance at 10mA for each diode.
3. Which factor determines the color of the emitted light of the LED?
4. A certain LED has a typical forward voltage of 2.2V, and a maximum current of 30mA. If
this diode is to be connected to a voltage source of 15V, determine the suitable value of the
current limiting resistor. Find the current flowing in the LED when the input voltage is
reduced to 8V. Assume the voltage drop across the diode remains constant.
5. Determine the minimum input voltage required to turn on the zener diode in the following
circuit.
Rg 1k
LED
Vo=1.9V
Vin
R=2.2k
Zener
Vz=3.3V
6. What are the features of LEDS over conventional bulbs? Name some applications for
LEDS.
7. A yellow colored LED with a forward voltage drop of 2.1V is to be connected to a 5.0V
stabilized DC power supply. Calculate the value of the series resistor required to limit the
forward current to less than 10mA. Also calculate the current flowing through the diode if a
1002 series resistor is used instead of the calculated first.
8. How can you connect two LED diodes with different colors in parallel to the same DC
power supply? Sketch the circuit diagram and justify the method of wiring.
Transcribed Image Text:3. Discussion 1. Plot the forward characteristics of each LED on the same graph. 2. From the sketched curves, determine the threshold voltage for each LED. Determine also the forward static resistance at 10mA for each diode. 3. Which factor determines the color of the emitted light of the LED? 4. A certain LED has a typical forward voltage of 2.2V, and a maximum current of 30mA. If this diode is to be connected to a voltage source of 15V, determine the suitable value of the current limiting resistor. Find the current flowing in the LED when the input voltage is reduced to 8V. Assume the voltage drop across the diode remains constant. 5. Determine the minimum input voltage required to turn on the zener diode in the following circuit. Rg 1k LED Vo=1.9V Vin R=2.2k Zener Vz=3.3V 6. What are the features of LEDS over conventional bulbs? Name some applications for LEDS. 7. A yellow colored LED with a forward voltage drop of 2.1V is to be connected to a 5.0V stabilized DC power supply. Calculate the value of the series resistor required to limit the forward current to less than 10mA. Also calculate the current flowing through the diode if a 1002 series resistor is used instead of the calculated first. 8. How can you connect two LED diodes with different colors in parallel to the same DC power supply? Sketch the circuit diagram and justify the method of wiring.
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