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An Engineer is tasked with implementing a lighting circuit with a 24 V battery. Part of the task included making sure power was conserved, e.g., ensuring the light stays off during daytime. The engineer selects a generic phototransistor to detect enough ambient light when present. The circuit below contains two transistors in series Q1, & Q2. This means that for the 35-Watt lamp (load) to work both transistors must be “ON” (or conducting), else the lamp is “OFF” (no current flows). Transistor Q1 is turned on by actuating the switch “SW1”. Transistor Q2 is turned on by the phototransistor Q4. The circuit is powered by a 24V Battery. Figure 1 shows the control circuit schematic and the simplified (equivalent) logic gate version of the circuit. (Hint: calculate your answer using Ohms law.)

An Engineer is tasked with implementing a lighting circuit with a 24 V battery. Part of the task included making sure power was conserved, e.g., ensuring the light stays off during daytime. The engineer selects a generic phototransistor to detect enough ambient light when present. The circuit below contains two transistors in series Q1, & Q2. This means that for the 35-Watt lamp (load) to work both transistors must be “ON” (or conducting), else the lamp is “OFF” (no current flows). Transistor Q1 is turned on by actuating the switch “SW1”. Transistor Q2 is turned on by the phototransistor Q4. The circuit is powered by a 24V Battery. Figure 1 shows the control circuit schematic and the simplified (equivalent) logic gate version of the circuit. (Hint: calculate your answer using Ohms law.)

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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An Engineer is tasked with implementing a lighting circuit with a 24 V battery. Part of the task included making sure power was conserved, e.g., ensuring the light stays off during daytime. The engineer selects a generic phototransistor to detect enough ambient light when present.

The circuit below contains two transistors in series Q1, & Q2. This means that for the 35-Watt lamp (load) to work both transistors must be “ON” (or conducting), else the lamp is “OFF” (no current flows). Transistor Q1 is turned on by actuating the switch “SW1”. Transistor Q2 is turned on by the phototransistor Q4. The circuit is powered by a 24V Battery. Figure 1 shows the control circuit schematic and the simplified (equivalent) logic gate version of the circuit.

(Hint: calculate your answer using Ohms law.)

SW1 Q1 photo transistor X1 Q4 B1 X2 24V Q2 R1 h AND Gate 10K R1 35 W LA1 35W 16.45 Figure 1- switch/phototransistor Control Circuit (Left), & simplified Control Light Circuit (Right) The transistors Q1 and Q2 must be sized for the application. How much current (Amps) will be drawn by the lamp?
Transcribed Image Text:SW1 Q1 photo transistor X1 Q4 B1 X2 24V Q2 R1 h AND Gate 10K R1 35 W LA1 35W 16.45 Figure 1- switch/phototransistor Control Circuit (Left), & simplified Control Light Circuit (Right) The transistors Q1 and Q2 must be sized for the application. How much current (Amps) will be drawn by the lamp?
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