Contents
- 1 How to calculate the current of a transistor?
- 2 What are the conditions of a transistor problem?
- 3 What is the resistance of a transistor in CE configuration?
- 4 What are the polarities of a transistor circuit?
- 5 Why are transistors still used in simple circuits?
- 6 What are the limits of a transistor circuit?
How to calculate the current of a transistor?
A voltage of 5 V is applied between collector and base. With collector positive, a current of 0.2 μA flows. When the base is disconnected and the same voltage is applied between collector and emitter, the current is found to be 20 μA. Find α, I E and I B when collector current is 1 mA.
What are the conditions of a transistor problem?
Fig. 4 Fig. 8.20 shows the conditions of the problem. Q11. For a transistor, β = 45 and voltage drop across 1kΩ which is connected in the collector circuit is 1 volt. Find the base current for common emitter connection.
What is the resistance of a transistor in CE configuration?
Q12. A transistor is connected in common emitter (CE) configuration in which collector supply is 8 V and the voltage drop across resistance R C connected in the collector circuit is 0.5 V. The value of R C = 800 Ω.
What should the AC of a transistor be?
Assume α ac to be nearly one. Fig.1 shows the conditions of the problem. Here the output resistance is very high as compared to input resistance, since the input junction (base to emitter) of the transistor is forward biased while the output junction (base to collector) is reverse biased.
What is the voltage drop across resistance in a transistor?
A transistor is connected in common emitter (CE) configuration in which collector supply is 8 V and the voltage drop across resistance R C connected in the collector circuit is 0.5 V. The value of R C = 800 Ω.
What are the polarities of a transistor circuit?
Fig. 10 (i) shows the transistor circuit while Fig. 10 (ii) shows the various currents and voltages along with polarities. Q18. In a transistor, I B = 68 μA, I E = 30 mA and β = 440.
Why are transistors still used in simple circuits?
Transistors, for example, typically have much higher operating voltage and power limits in simple circuits than those of comparable ICs. Electronics manufacturers and distributors still make and sell individual transistors because the parts still have some uses.
What are the limits of a transistor circuit?
The transistor can’t drive the collector to the emitter voltage, so it’s saturated. The limitation of this specific circuit, therefore, is a maximum input voltage of about 1.3 V. At the other end, anything less than 0.7 V causes the transistor to go into cutoff.