+8 V R
Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter9: Measuring Instruments
Section: Chapter Questions
Problem 1RQ: To what is the turning force of a dArsonval meter movement proportional?
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Question
There are two LEDs that can be used as a polarity detector. Apply a positive source voltage and a green light results. Negative supplies result in a red light. Packages of such combinations are commercially available.Find the resistor R to ensure a current of 20 mA through the “on” diode for the configuration. Both diodes have a reverse breakdown voltage of 3 V and an average turn-on voltage of 2 V
![+8 V
R
Red
Green](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F96586dc3-ae96-49fa-a216-a30892ad2bb9%2F9722a670-9cb7-4dec-9bd6-ed128089ed33%2Fn4drx7p_processed.jpeg&w=3840&q=75)
Transcribed Image Text:+8 V
R
Red
Green
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