Consider the circuit in the intro video in UVLE as shown in the circuit below +12V R;=12K R2 The light-dependent-resistor (LDR) R2 is 1MN 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.

Introductory Circuit Analysis (13th Edition)
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Consider the circuit in the intro video in UVLE as shown in the circuit below
+12V
R3=12K
R2
The light-dependent-resistor (LDR) R2 is 1MQ 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:Consider the circuit in the intro video in UVLE as shown in the circuit below +12V R3=12K R2 The light-dependent-resistor (LDR) R2 is 1MQ 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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