What is the Voltage Source

20 - Oct - 2019

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zahidali

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Hello friends, I hope you all are doing great. In today’s tutorial, we will discuss What is the Voltage Source. The source is a device that transformed thermal energy, chemical energy, mechanical energy or any type of energy in the electrical form of energy. We can say that the source is such an instrument manufactured for generating electrical power. The voltage source has 2 endpoints by which it connects in the circuitry, the ideal voltage source gives the constant value of the voltage in a circuitry irrespective of the variation in the resistance of the output. While non-ideal voltage source cannot provide the same voltage to the circuitry during load variation. The voltage source is the correspondent of the current source. This eclectic source ( voltage source) can be classified as the direct current or alternating current sources, the source which provides the constant value of voltage is called dc and other is called alternating source in this source polarity of voltage changes after some interval of time like sine waveform. The battery is the example of the direct current (DC) source and the power supplies in our homes is known (AC) sources. In today's post, we will have a look at its circuit, types, use and working. So, let's get started with what is the voltage source.

What is the Voltage Source

The voltage source is an instrument which delivers the constant value of voltage in a circuitry irrespective of the variation in the resistance offered by the load.
Such voltage source is also named as an ideal voltage source. In real-world such voltage source can be created, by assigning the 0 inner resistance and it can deliver constant voltage.

The graphical representation of the ideal source is drawn in the figure. You can see that it is the straight line at any point of the time axis.
If there is some quantity of internal resistance is exiting in the source then it is named as a real voltage source.
As there is inner resistance is present in the source this causes to loss of voltage in the circuitry according to the value of this resistance in the circuitry.
The graphical representation of the practical voltage source is drawn in the given diagram.

Types of Voltage Source

There are the two main types of the voltage source first one is dependent source and other is the independent.
The dependent voltage source has further two types.
- Voltage control voltage source
- current control current source
Independent source also has two catagories.
- DC Voltage source
- AC voltage source
Now discuss all these categories one by one

Independent Voltage Source

This voltage source provides the constant value of the voltage, its voltage value does not depend on the other parameters of circuitry like resistance, or capacitance of the circuitry.

DC Voltage Source

This voltage source provides the constant voltage at the output is called a dc source.
In this source, the electrons move in the same direction, so its polarity will not vary.
The output voltage of this source will remain the same, it will not vary with the time.
The examples of the dc voltage sources are the direct current generator, battery, or cell.

Alternating Voltage Source

Such voltage source generates the AC current as output is known as the alternating source.
In this source the polarity of voltage changes after a specific interval of time.
Due to the variation in the voltage for after some time current also changes its direction.
Examples of such sources are Ac generators or direct current to alternating current converter
The given diagram shows the circuit of the alternating voltage source.

Dependent Voltage Sources

The output of the source does not remain constant but continuously vary is called a dependent voltage source.
Its output voltage varies according to the changing in the other parameters of circuitry like current, resistance.
If the voltage of the source depends on the voltages of other components of the circuitry then it called voltage-controlled voltage source.
If the value of the voltages of the voltage source depends on the current of the other components then it known as the current-controlled voltage source.
The given diagram shows all these voltage sources.

Comparison Between Voltage Source and Current Source

Voltage source

Mostly sources of electrical power like battery are known as a voltage source.
In case of open circuitry, the ideal source delivers no power, in case of short circuitry it gives infinite power.
This ideal device has the 0-ohm internal resistance but the practical source has less value of inner resistance but not zero.

Current Source

The current source delivers the non-variable current when the connected load has less value of resistance.
In the case of the short circuitry, the ideal source delivers the no power, but in case of open circuit, its power value becomes infinity.
The ideal source has infinite resistance value and the practical source has high but in some limit value of the resistance.

Ideal Voltage Source

The source which has no interior resistor (R) is named as an ideal source.
It incomes that there is no voltage drop in the source, due to this we get the same voltage at output points which were produced by the source.
Each practical (applied) voltage source like the battery has some value of resistor which causes to drop of voltage.
To understand the practical difference among the ideal and practical source we discuss an example.
In case of ideal source, if we have five volts battery, it will give five volts at output points as it has no internal resistance.
But in case of practical voltage source, we do not get five volts at terminals due to some loss of voltage at interior resistance ®.

It is the detailed article about the voltage source if you have any question about it ask in comments. Thanks for reading. Take care until the next tutorial.