What is the DC gain of the transistor NPN?

An NPN Transistor has a DC current gain, (Beta) value of 200. Calculate the base current Ib required to switch a resistive load of 4mA. Therefore, β = 200, Ic = 4mA and Ib = 20µA. One other point to remember about NPN Transistors.
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What is DC current gain in transistor?

The common - base DC current gain of a transistor is 0.967 .
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What is the output of NPN transistor?

In a common base NPN transistor, collector current (IC) is output current, and emitter current is input current (IE). Here collector current is output current, and base current is input current. The value of the β may vary in the range of 20 to 1000 for low-power transistors that operate in high frequencies.
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How do you calculate the current gain of a transistor?

Current gain is the ratio of the change in the collector current to the change in the emitter current in a transistor. Mathematically α=△Ic△Ie.
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What is AC current gain of transistor?

The ac current gain in a transistor in CE mode is 120.
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Electrical Engineering: Ch 3: Circuit Analysis (29 of 37) NPN Transistor Current Gain



How do you find the gain of a circuit?

Amplifier gain is simply the ratio of the output divided-by the input. Gain has no units as its a ratio, but in Electronics it is commonly given the symbol “A”, for Amplification. Then the gain of an amplifier is simply calculated as the “output signal divided by the input signal”.
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How a transistor acts as a switch?

The transistor operates as a Single Pole Single Throw (SPST) solid state switch. When a zero input signal applied to the base of the transistor, it acts as an open switch. If a positive signal applied at the input terminal then it acts like a closed switch.
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What is voltage gain and current gain?

Current gain and voltage gain Ai = Pac dI iB Current gain (AI) is defined as the ratio of the output current to the input current of the transistor. For CE amplifier in forward active region, A; = Bac = dic – ic Voltage gain (Ay) is defined as the ratio of the output voltage to the input voltage of the transistor.
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What is current gain value?

By definition, current gain β is defined as the ratio of change in collector current to change in base current for a constant collector voltage in a common emitter circuit. β=ΔiBΔiC or simply β=IBIC. Generally, β has value between 20 and 200.
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What is voltage gain in transistor?

It is simply the ratio of the output voltage to the input voltage. If for example the input signal in a transition amplifier is of 1 Voltage and the output made by it carries 50 Voltage then, the voltage gain here is going to be the ratio of the input signal to the output signal resulting into the voltage gain as 50:1.
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What is DC load line?

The DC load line is the load line of the DC equivalent circuit, defined by reducing the reactive components to zero (replacing capacitors by open circuits and inductors by short circuits). It is used to determine the correct DC operating point, often called the Q point.
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How is NPN calculated?

NPN Transistor Example No1

A bipolar NPN transistor has a DC current gain, (Beta) value of 200. Calculate the base current Ib required to switch a resistive load of 4mA. Therefore, β = 200, Ic = 4mA and Ib = 20µA. One other point to remember about Bipolar NPN Transistors.
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What does an NPN transistor do?

The NPN transistor is designed to pass electrons from the emitter to the collector (so conventional current flows from collector to emitter). The emitter "emits" electrons into the base, which controls the number of electrons the emitter emits.
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What is NPN and PNP transistor?

An NPN transistor has a piece of P-type silicon (the base) sandwiched between two pieces of N-type (the collector and emitter). In a PNP transistor, the type of the layers are reversed. Below is a typical cross section of a transistor.
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What is beta in NPN transistor?

The beta (β) of a transistor, or transistor current gain, is the ratio of the transistor's collector current (Ic) to its base current (Ib), as shown in Equation 1. β = Ic/Ib. (1) The β value is fixed for a given transistor and operating condition.
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How do you calculate DC Beta?

formula 1) alpha DC=Ic/Ie. formula 2) beta DC =Ic/Ib.
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What is transistor hFE?

hFE of a transistor is the current gain or amplification factor of a transistor. hFE (which is also referred to as β) is the factor by which the base current is amplified to produce the amplified current of the transistor.
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What is DC gain of an amplifier?

DC gain is the amplification (multiplication) of DC input voltage (at an OPAMP) A = U(out) / U(in); all under DC conditions. AC gain ist the same as with DC, but you need to know what (AC) frequency. OPAMP circuits (with feedback = closed loop) that have different gain at different frequencies are called "filters".
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What is voltage gain formula?

Voltage gain (dB) = 20×log (Audio output voltage / Audio input voltage). Used in audio. Voltage gain is defined as the ratio of the output voltage to the input voltage in dB.
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How NPN transistor is used as a switch?

NPN Transistor as a Switch

Based on the voltage applied at the base terminal of a transistor switching operation is performed. When a sufficient voltage (VIN > 0.7 V) is applied between the base and emitter, collector to emitter voltage is approximately equal to 0. Therefore, the transistor acts as a short circuit.
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When an NPN transistor is used as an amplifier?

When NPN transistor is used as an amplifier, majority charge carrier electrons of N-type emitter move from emitter to base and then base to collector.
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What NPN means?

It's easy to remember that NPN stands for Negative-Positive-Negative and PNP stands for Positive-Negative-Positive transistors. Let's take a closer look at how NPN and PNP transistors work. NPN transistor is powered on when enough current is supplied from the transistor base to the emitter.
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