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Myrddin
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Doing practice exam papers for electronics module, can someone explain to me how to go about this question?
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http://img402.imageshack.us/i/electronicsquestions.jpg/
Myrddin said:Doing practice exam papers for electronics module, can someone explain to me how to go about this question?
http://img402.imageshack.us/i/electronicsquestions.jpg/
To solve for voltage, current, and resistance in a transistor circuit, you can use the basic equations of Ohm's Law: V=IR (voltage = current x resistance) and P=IV (power = current x voltage). You will also need to understand how to use Kirchhoff's Laws to analyze the circuit and determine the voltage and current flow at different points. Additionally, you will need to know how to apply the relevant transistor equations, such as the Ebers-Moll equation, to determine the behavior of the transistor in the circuit.
To determine the biasing of a transistor in a circuit, you will need to analyze the circuit using Kirchhoff's Laws and the relevant transistor equations. This will allow you to determine the voltage and current at the base, emitter, and collector terminals of the transistor. From there, you can compare the values to the appropriate biasing conditions for the type of transistor (NPN or PNP) and determine if the transistor is under- or over-biased.
In a common emitter transistor circuit, the input signal is applied to the base terminal and the output signal is taken from the collector terminal. In a common collector circuit, the input signal is applied to the base terminal and the output signal is taken from the emitter terminal. The main difference between the two is that a common emitter circuit provides a voltage gain, while a common collector circuit provides a current gain.
The gain of a transistor circuit can be calculated by dividing the output signal (voltage or current) by the input signal (voltage or current). For a common emitter circuit, the voltage gain is typically calculated as the change in collector voltage divided by the change in base voltage. For a common collector circuit, the current gain is typically calculated as the change in collector current divided by the change in base current. The gain is typically denoted using the symbol β (beta) for a common emitter circuit and γ (gamma) for a common collector circuit.
The biasing point of a transistor in a circuit can be determined by analyzing the circuit using Kirchhoff's Laws and the relevant transistor equations. This will allow you to determine the voltage and current at the base, emitter, and collector terminals of the transistor. From there, you can compare the values to the appropriate biasing conditions for the type of transistor (NPN or PNP) and determine the biasing point, also known as the operating point or Q-point, of the transistor.