Bipolar Junction Transistor(BJT) as a Amplifier

Amplification

As we have discussed the other uses of BJTs in previous posts, now there is another main use or advantage of Bipolar transistor is that it can amplify the input signal whether it is voltage or current. As some time we need to amplify the current and sometimes voltage. We provide an input signal to the BJT, and it produces the amplified signal at the output. The gain of the amplifier can be calculated by the ratio of output to the input value of current or voltage. The amplifier does not change the waveform or frequency. It just affects the current and voltage.

How to make BJT an Amplifier:

To make BJT work as amplifier we need to do some different types of configuration of it, in a circuit. There are three configurations, which we can do,

•        Common Base Configuration (only has voltage gain).
•       Common Emitter Configuration (has both voltage and current gain)
•       Common Collector Configuration (only has current gain)

What is motion? Types of motion

Motion:-

When a body does not change its position with time it is said that it is in rest but when it changes it is called that body is in motion.

Types of Motion:-

There are few basic types of motion:

1. Translational motion

2. Rotational motion

3. Random motion

4. Circular motion

Translational:-

A body covering some distance while moving whether it is on straight line or curved line, but distance covering is necessary. it is known as translational motion.

i.e. You driving a car towards your destination the road sometimes will not be straight turns will come but you will cover distance.

Rotational:-

A body moving on its axis and its all parts have different directions. no matter in which direction it moves but move on its axis is known as rotational motion.

i.e. A beblayde moving on its axis, a fan blades moving.

Random Motion:

When a body moves randomly, it is known as random motion.
Random motion means when body doesn't follow a specific path just a zig zag type path to move then this movement is known as random motion.

i.e. Fly, Mosquitoes etc,  flying around you randomly is an example of random motion.

Circular Motion:

When a body moves in a circular path, it is known as circular motion.

it is simple type of motion when body moves in a closed circular path it is known as circular motion.

i.e. a racing car moving on a circular racing track.

laws of motion. explanation

There are 3 laws of motion. It is described(invented) by Newton.
They're:

1.First law of motion (law of inertia)

"An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force"

Explanation:

It means that a body in rest condition, will remain in rest until a force will act, whether is the Force by human, air or from anywhere.

 Example:

 A book will remain on table unless you will pick it or it is blow away by some wind. And body will remain in motion unless some force will stop it. I.e. A car will never stop until you break it.

2. Second law of motion

" Acceleration of an object is dependent upon two variables - the net force acting upon the object and the mass of the object."

Explanation:

It means that if a body has change in its velocity(speed) or position, then its depend upon the total force acting upon him and the mass of the body. It is also known as law of inertia. Having low mass will demand less force for change in its speed.

Example:

If you will apply same force on car and then truck. Car will have more acceleration than truck because car have less mass with respect to the truck.

Formula:

acceleration = Force/mass (a=F/m)

                                        F= a.m

Third law of motion:-

"For every action, there is an equal and opposite reaction."

Explanation:-

Its means that if there will be action from some body to other body, there is always a re-action from other body equal in force but opposite in direction.

Example:-

If you throw the tennis ball to the wall then ball will return back to you with same speed. You throw the ball it is an action the ball returns it is an reaction and in opposite direction.