# What is an ideal voltage source and an ideal current source?

Regardless of the load resistance size and the size of the output current, the output voltage of an ideal voltage source does not change. The output power of a perfect voltage source can Regardless of the size of the load resistance and the size of the output current, the output voltage of an ideal voltage source does not change.

The output power of an ideal voltage source can be infinite, and the ideal voltage source cannot short-circuit. Regardless of the load resistance size and the size of the output voltage, the output current of the ideal current source remains unchanged. The output power of an ideal current source can be infinite, and the ideal current source does not allow an open circuit. What is an ideal voltage source and an ideal current source？

## What is an ideal voltage source?

An ideal voltage source is defined as an active element at both ends, capable of supplying and maintaining the same voltage, (v) at its terminals regardless of current, and (i) flowing through it. In other words, an ideal voltage source will always provide a constant voltage, regardless of whether the value of the current supplied produces the IV characteristic represented by the straight line.

An ideal voltage source is then called an independent voltage source because its voltage does not depend on the value of the current flowing through the head or its direction but is determined solely by the original weight. So, for example, a car battery’s 12V terminal voltage will remain constant as long as the current through it doesn’t get higher, supplying power to the car in one direction and drawing power in the other direction as it charges.
On the other hand, the magnitude of the voltage source provided by the associated or controlled voltage source depends on the voltage or current flowing through some other circuit element. Dependent voltage sources, represented by diamonds, are used as equivalent power supplies for electronic devices, such as transistors and operational amplifiers.

## What is an ideal current source?

An ideal current source is called a “constant current source” because it provides a constant steady-state current regardless of the load connected to it, resulting in an IV characteristic represented by a straight line. As a voltage source, a current source can be independent (ideal) or dependent (controlled) of a voltage or current elsewhere in the circuit.

The voltage or current itself can be constant or time-varying. Excellent independent sources are often used to solve circuit theorems and circuit analysis techniques for courses containing essential active components.

In its simplest form, a current source is a resistor in series with a voltage source, producing currents ranging from a few milliamps to hundreds of amps. Remember that a zero value current source is an open circuit, R = 0.
The concept of a current source is that of a double-ended element, which allows the current to flow by arrows. The current source has a value I in amperes, (A) often abbreviated to amperes. Ohm’s law gives the physical relationship between the existing sources and voltage variables around the network, as these voltage and current variables will have specified values.

It can be challenging to determine the magnitude and polarity of the voltage. The ideal current source is like an existing function, especially when other voltages or current sources are present in the connecting circuit. Then we can know the current source’s contemporary but not the current supplied by the current source unless the power provided by the current source is like P = V * I.
However, if the current source is the only source in the circuit, the voltage polarity across the original will be easier to establish. However, if there are multiple sources, the terminal voltage will depend on the sources’ network. Wire current sources Like voltage sources, ideally, can also connect current sources to increase (or decrease) the available current. But there are rules on connecting two or more independent current sources with different values, either in series or in parallel.

## Ideal voltage source and ideal current source in series and parallel

When an ideal voltage source is connecting in series with an excellent current source, the current in the circuit is equal to the current source’s present, and the current source works. When an ideal voltage source connects in parallel with an excellent current source, the voltage across the power supply is equal to the voltage of the voltage source, and the voltage source works.

## Ideal power supply and resistor in series and parallel

The ideal voltage source connects in parallel with the resistor, and the resistor can be removed (disconnected) without affecting the analysis of other circuits. An excellent current source connects in series with a resistor, and the resistor can be removed (short-circuited) without affecting the study of different courses.

## Voltage and current sources in practical applications

The actual voltage source can represent by the series connection of an ideal voltage source and internal resistance. The current source can mean the parallel relationship between a definitive current source and an internal resistance.