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Study the circuit below: +12V R2 is a light-dependent-resistor (LDR). It is 5002 when exposed to light and 1MQ when covered. Each diodes has a forward voltage of 5V, so that the total voltage across it is 10V R1=12K when ON. R2 Su se: VBE,ON = 0.7V VCE,SAT = 0.6V 1. Assume that the LDR is exposed to light and diodes are ON and the BJT is forward active. Is our assumption correct? If so, explain and verify. (If not, identify the state of the diodes and BJT. Verify and explain why our assumption is incorrect.) 2. Assume that the LDR is covered. What is the state of the diodes and the BJT? Explain and verify.

Study the circuit below: +12V R2 is a light-dependent-resistor (LDR). It is 5002 when exposed to light and 1MQ when covered. Each diodes has a forward voltage of 5V, so that the total voltage across it is 10V R1=12K when ON. R2 Su se: VBE,ON = 0.7V VCE,SAT = 0.6V 1. Assume that the LDR is exposed to light and diodes are ON and the BJT is forward active. Is our assumption correct? If so, explain and verify. (If not, identify the state of the diodes and BJT. Verify and explain why our assumption is incorrect.) 2. Assume that the LDR is covered. What is the state of the diodes and the BJT? Explain and verify.

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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Study the circuit below: +12V R2 is a light-dependent-resistor (LDR). It is 5000 when exposed to light and 1MQ when R1=12K covered. Each diodes has a forward voltage of 5V, so that the total voltage across it is 10V when ON. R2 Suppose: VBE,ON = 0.7V VCE,SAT = 0.6V 1. Assume that the LDR is exposed to light and diodes are ON and the BJT is forward active. Is our assumption correct? If so, explain and verify. (If not, identify the state of the diodes and BJT. Verify and explain why our assumption is incorrect.) 2. Assume that the LDR is covered. What is the state of the diodes and the BJT? Explain and verify.
Transcribed Image Text:Study the circuit below: +12V R2 is a light-dependent-resistor (LDR). It is 5000 when exposed to light and 1MQ when R1=12K covered. Each diodes has a forward voltage of 5V, so that the total voltage across it is 10V when ON. R2 Suppose: VBE,ON = 0.7V VCE,SAT = 0.6V 1. Assume that the LDR is exposed to light and diodes are ON and the BJT is forward active. Is our assumption correct? If so, explain and verify. (If not, identify the state of the diodes and BJT. Verify and explain why our assumption is incorrect.) 2. Assume that the LDR is covered. What is the state of the diodes and the BJT? Explain and verify.
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