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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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
Transcribed Image Text:+8 V R Red Green
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