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What is base resistance Rb?

Base resistance (Rb) is the resistance seen by the base terminal of a transistor when analyzing its behavior in a circuit. It is a parameter used to model the input impedance of the transistor and is crucial in determining the biasing and signal amplification characteristics of the transistor circuit.


Why you go for bootstrap circuit?

Bootstrapping is used to allow bias to be applied to the base of a transistor while maintaining a very high input impedance.


What is a driver transistor?

dirver transistor is added in a circuit so as to provide required voltage at an operating current which can not be provided by the microcontroller


Why short circuit calculation is not required for LT cables?

Lt cables has own impedance which reduce the short circuit fault level


Impedance of electric circuit?

The impedance of electric circuit refers to the measure of the opposition that a circuit presents to a current when a voltage is applied.


Short definition of impedance in connection with ac?

Impedance in an AC circuit is like resistance. In fact, impedance is measured in ohms, just like resistance. Impedance takes into account the fact that current and voltage are often not in phase with each other due to capacitive and inductive reactance.


Techniques required for increasing the input impedance?

...of what? to a house, to a breaker (to lower fault current level?), to an amplifier circuit?


Why is it necessary to bias a transistor when it is to be used as an amplifier?

Biasing is necessary in a transistor circuit to keep the transistor working. Without proper biasing, the circuit will fail


The total opposition to an alternating current presented by a circuit is called a?

impedance


What is the relationship between impedance and phase angle in an electrical circuit?

In an electrical circuit, impedance and phase angle are related because impedance affects the phase angle of the current in the circuit. The phase angle represents the time delay between the voltage and current waveforms in the circuit. A change in impedance can cause a shift in the phase angle, impacting the overall behavior of the circuit.


How does capacitor improves the performance of a circuit?

This depends on what kind of circuit you have. Generally, you cannot just add a capacitor to a circuit and 'improve it'. Probably, though, you mean an amplifier, anf by improve, you mean improved frequency response. In a transistor amplifier, you sometimes want increased gain at higher frequencies. By adding a capacitor from the emitter to ground, you create a low impedance path to ground for the AC signal. This lowered emitter impedance increases the gain of the amplifier, for frequencies where the capacitor looks like a low impedance, or high frequencies.


At a frequency below the resonant frequency parallel circuit is?

A parallel resonant circuit has low impedance, when non resonant; however the impedance rises sharply, as the circuit comes to resonance.