In STEP 1, before SW1 is closed, where is current flowing in this circuit? O No current is flowing. The switch is open and the transistor is not allowing any current to flow. O Before the switch is closed, current flows through the transistor base to the emitter. After the switch is closed, current flows from the collector to the emitter, allowing it to flow through D1, which will then light. O Before the switch is closed, current bypasses the transistor, so D1 cannot light. O Since D1 is reversed, no current can flow unless SW1 is pressed, triggering the transistor base to allow current to flow back through the LED.
In STEP 1, before SW1 is closed, where is current flowing in this circuit? O No current is flowing. The switch is open and the transistor is not allowing any current to flow. O Before the switch is closed, current flows through the transistor base to the emitter. After the switch is closed, current flows from the collector to the emitter, allowing it to flow through D1, which will then light. O Before the switch is closed, current bypasses the transistor, so D1 cannot light. O Since D1 is reversed, no current can flow unless SW1 is pressed, triggering the transistor base to allow current to flow back through the LED.
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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KVL and KCL
KVL stands for Kirchhoff voltage law. KVL states that the total voltage drops around the loop in any closed electric circuit is equal to the sum of total voltage drop in the same closed loop.
Sign Convention
Science and technology incorporate some ideas and techniques of their own to understand a system skilfully and easily. These techniques are called conventions. For example: Sign conventions of mirrors are used to understand the phenomenon of reflection and refraction in an easier way.
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