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1. Consider the circuit below +12V R1=12K R2 The light-dependent-resistor (LDR) R2 is 1M2 when itť's covered and 5002 when exposed to light. Leť's model the LED lamp chip as two diodes in series, each with a forward voltage of 5V, so that the total voltage across it, when on, is 10V Assume beta = 100, VBe,On=0.7 and VCE,SAT=0.6V a. Suppose R2 is exposed to light and we assume the BJT is F.A. and the LED's are ON. Verify if our assumptions are correct. If the verification fails, what is a more appropriate state for the BJT and the LEDS? b. Suppose R2 is covered. Determine and verify the state of the BJT and the diodes.

1. Consider the circuit below +12V R1=12K R2 The light-dependent-resistor (LDR) R2 is 1M2 when itť's covered and 5002 when exposed to light. Leť's model the LED lamp chip as two diodes in series, each with a forward voltage of 5V, so that the total voltage across it, when on, is 10V Assume beta = 100, VBe,On=0.7 and VCE,SAT=0.6V a. Suppose R2 is exposed to light and we assume the BJT is F.A. and the LED's are ON. Verify if our assumptions are correct. If the verification fails, what is a more appropriate state for the BJT and the LEDS? b. Suppose R2 is covered. Determine and verify the state of the BJT and the diodes.

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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1. Consider the circuit below +12V R1=12K R2 The light-dependent-resistor (LDR) R2 is 1M2 when it's covered and 5002 when exposed to light. Let's model the LED lamp chip as two diodes in series, each with a forward voltage of 5V, so that the total voltage across it, when on, is 10V Assume beta = 100, VBe,on=0.7 and VCe,SAT=0.6V a. Suppose R2 is exposed to light and we assume the BJT is F.A. and the LED's are ON. Verify if our assumptions are correct. If the verification fails, what is a more appropriate state for the BJT and the LEDS? b. Suppose R2 is covered. Determine and verify the state of the BJT and the diodes.
Transcribed Image Text:1. Consider the circuit below +12V R1=12K R2 The light-dependent-resistor (LDR) R2 is 1M2 when it's covered and 5002 when exposed to light. Let's model the LED lamp chip as two diodes in series, each with a forward voltage of 5V, so that the total voltage across it, when on, is 10V Assume beta = 100, VBe,on=0.7 and VCe,SAT=0.6V a. Suppose R2 is exposed to light and we assume the BJT is F.A. and the LED's are ON. Verify if our assumptions are correct. If the verification fails, what is a more appropriate state for the BJT and the LEDS? b. Suppose R2 is covered. Determine and verify the state of the BJT and the diodes.
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