How does transistor work as an amplifier?

A transistor acts as an amplifier by raising the strength of a weak signal. The DC bias voltage applied to the emitter base junction, makes it remain in forward biased condition. Thus a small input voltage results in a large output voltage, which shows that the transistor works as an amplifier.

Does amplifier violate energy conservation?

The Law of Conservation of Energy is not violated because the additional power is supplied by an external source, usually a DC battery or equivalent. The amplifier neither creates nor destroys energy, but merely reshapes it into the waveform desired as shown in the figure below.

Does transistor violate the law of conservation of energy?

Strictly speaking, a transistor is a passive device that shuttles energy from other parts of the circuit. Consequently, there is no violation of the conservation of energy.

Can transistors store energy?

The energy comes from the power supply. It is not generated within the transistor. The ‘catch’ is that a transistor only controls the flow of current; it does not itself generate power. The power would come from some other part of the circuit, perhaps from the electric company via a power supply or from a battery.

How do amplifiers work in physics?

An amplifier takes an input signal from a source, such as a laptop, turntable or CD player, and creates a larger copy of the original signal before it’s sent to the speakers. It gets the power to do this from your mains electricity, which is sent directly to the power supply within the amplifier.

What is amplifier in electronics circuit?

An amplifier, electronic amplifier or (informally) amp is an electronic device that can increase the power of a signal (a time-varying voltage or current). An amplifier is a circuit that has a power gain greater than one.

How do transistors save data?

Transistors are special because they can amplify electrical signals, turning a low-power signal into a similar signal of much higher power. two transistors can make a flip flop which will store one bit of digital information.

When a transistor is used as an amplifier then?

For a npn transistor to be used as an amplifier, forward bias has to be applied on the transistor. Thus, when an npn transistor is used as an amplifier, holes move from base to emitter. So, the correct answer is option D i.e. holes move from base to emitter.

Why do we need a transistor as an amplifier?

The need for transistor as an amplifier arises when we want to increase or amplify the input signal. A transistor can take in a very small weak signal through the base junction and release the amplified signal through the collector.

Why do we use CE configuration for transistors as amplifiers?

We usually employ CE configuration for transistors as amplifiers because it provides large values of current gain, voltage gain and power gain. Moreover, there is a phase-shift of 180 degrees between input and output. It implies the output signal will be an inverted amplified version of the signal given in the input.

Why does a capacitor reduce voltage gain in an amplifier?

This will result in an overall reduction of voltage gain associated with the amplifier. The capacitor C E connected across R E provides a short circuit path for the AC signal and reduce the effect of additional negative feedback due to the AC signal and a corresponding reduction in voltage gain.

What is the phase shift between input and output of transistor?

Moreover, there is a phase-shift of 180 degrees between input and output. It implies the output signal will be an inverted amplified version of the signal given in the input. As we come to the end of the lesson, we have to know and remember that a transistor amplifier in order to function properly must have the following things;