Podcast
Questions and Answers
What is the primary function of a Bipolar Junction Transistor in the experiment?
What is the primary function of a Bipolar Junction Transistor in the experiment?
- To amplify current
- To act as a switch (correct)
- To regulate voltage
- To convert AC to DC
In the cut-off region of the transistor, the base voltage is:
In the cut-off region of the transistor, the base voltage is:
- Exactly 0.7 V
- Less than 0.7 V (correct)
- Higher than 0.7 V
- Equal to the collector current
What happens to the collector current when the base bias voltage is increased above 0.7 V?
What happens to the collector current when the base bias voltage is increased above 0.7 V?
- Collector current remains constant
- Collector current starts to flow (correct)
- Collector current becomes negative
- Collector current decreases
What is the significance of the resistor values used in the experiment, Rb = 470Ω and Rc = 4.7KΩ?
What is the significance of the resistor values used in the experiment, Rb = 470Ω and Rc = 4.7KΩ?
In which condition does the transistor behave like a closed switch?
In which condition does the transistor behave like a closed switch?
Which component is not necessary for observing the LED's behavior in the circuit?
Which component is not necessary for observing the LED's behavior in the circuit?
What describes the base current in the cut-off region of the transistor?
What describes the base current in the cut-off region of the transistor?
When observing the LED's intensity in relation to the base voltage, what is expected?
When observing the LED's intensity in relation to the base voltage, what is expected?
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Study Notes
Transistor Circuit Experiment
- This experiment demonstrates how a Bipolar Junction Transistor (BJT) can act as a switch
- The circuit includes a BJT (SL 100 NPN), an LED, two resistors, a power supply, a function generator, and a digital voltmeter
- The BJT is used to control the current flowing through the LED based on the voltage applied to its base terminal
- The principle is that the base current of a BJT controls the collector current
- Two critical operating regions for the BJT are:
- Cut-off region: When the base voltage is less than 0.7V, the base current is minimal, and collector current is negligible
- Saturation region: When maximum base current is applied, the collector current is high, and the collector-emitter voltage is low
- When the BJT is in the cut-off state, it acts as an open switch, preventing current flow through the LED
- As the base voltage increases beyond 0.7V, the BJT enters saturation, acting as a closed switch, and current flows through the LED
- The experiment uses a function generator to apply square waveforms to the base of the BJT, causing the BJT to alternate between cut-off and saturation
- This results in the LED switching on and off, with the brightness of the LED being directly proportional to the base voltage
- The experiment uses a specific value of a 470Ω resistor in the base circuit, but this can be adjusted to experiment with different base current values
- The experiment also uses a resistance value of 4.7kΩ for the collector resistor, which influences the current flowing through the LED. This value can be changed to explore the effect of collector resistance on LED brightness.
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