RL V, R1 CdS
Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter30: Dc Motors
Section: Chapter Questions
Problem 6RQ: What is CEMF?
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Question
Design the following conditions using an operational amplifier:
Cadmium sulfide (CdS) is commonly used to fabricate resistors whose value depends on the intensity of light shining on its surface. In Figure 1, a CdS “photocell” is used as the feedback resistor Rf. In total darkness, it has a resistance of 100kΩ and a resistance of 10kΩ under a light intensity of 6 candela. RL represents a circuit that is activated when a voltage of 1.5V or less is applied to its terminals. Choose R1 and VS so that the circuit represented by RL is activated by a light of 2 candela or brighter.
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