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Q6. The forward turn-on voltage (Va) of a LED is 1.4 V and a forward current of 12mA is needed to produce the required brightness as shown in Fig. Q6. Vin 3.5V LED R Vd Fig. Q6 (a) Calculate the value of the series resistor (R) required to limit the forward current to 12 mA. (b) Calculate the current flowing through the diode if a 250 N series resistor (R) is used instead of the calculated series resistor in (a). (c) To double the light intensity, two LEDs can be connected in series or parallel. Explain which connection is preferred. Design the value of R for your selected connection.

Q6. The forward turn-on voltage (Va) of a LED is 1.4 V and a forward current of 12mA is needed to produce the required brightness as shown in Fig. Q6. Vin 3.5V LED R Vd Fig. Q6 (a) Calculate the value of the series resistor (R) required to limit the forward current to 12 mA. (b) Calculate the current flowing through the diode if a 250 N series resistor (R) is used instead of the calculated series resistor in (a). (c) To double the light intensity, two LEDs can be connected in series or parallel. Explain which connection is preferred. Design the value of R for your selected connection.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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Q6. The forward turn-on voltage (Va) of a LED is 1.4 V and a forward current of 12mA is needed to produce the required brightness as shown in Fig. Q6. Vin 3.5V LED R Vd Fig. Q6 (a) Calculate the value of the series resistor (R) required to limit the forward current to 12 mA. (b) Calculate the current flowing through the diode if a 250 N series resistor (R) is used instead of the calculated series resistor in (a). (c) To double the light intensity, two LEDs can be connected in series or parallel. Explain which connection is preferred. Design the value of R for your selected connection.
Transcribed Image Text:Q6. The forward turn-on voltage (Va) of a LED is 1.4 V and a forward current of 12mA is needed to produce the required brightness as shown in Fig. Q6. Vin 3.5V LED R Vd Fig. Q6 (a) Calculate the value of the series resistor (R) required to limit the forward current to 12 mA. (b) Calculate the current flowing through the diode if a 250 N series resistor (R) is used instead of the calculated series resistor in (a). (c) To double the light intensity, two LEDs can be connected in series or parallel. Explain which connection is preferred. Design the value of R for your selected connection.
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