WHAT ARE THE TYPES OF SOURCES IN AN ELECTRIC CIRCUIT?
- Raktangi Swain
- Sep 7
- 2 min read
The types of sources in an electric circuit are categorized on different bases. The primary function of an electric source is to provide the energy required to create a voltage and produce an electric current in the circuit. The electrical sources provide power to a circuit.

Types of sources in an electric circuit
Primary types of electric sources
The primary types of sources in an electric circuit are
Voltage source: is an electric source that maintains a constant voltage, providing the required electrical energy for maintaining current through a circuit.
Current source: is an electric source which provides or absorbs a constant current, independent of the voltage in the circuit.
Types of sources based on whether they provide constant or variable voltage or current
The types of sources, based on whether they provide constant or variable voltage or current, are as follows
Independent sources: Independent sources are the sources that provide a constant voltage or current, regardless of the conditions of the circuit elements. The resultant voltage of an independent source is found from its own characteristics and does not change based on other components in the circuit.
Independent voltage source: An independent voltage source is a type of independent source that provides a constant voltage, either constant (DC) or time-varying (AC), regardless of the circuit conditions.
Independent current source: An independent current source is a type of independent source that provides a constant current, either a constant current or a time-varying current, regardless of the circuit conditions.
Dependent sources: Dependent sources are the sources that are controlled by other variables (voltage or current) in a circuit. The dependent sources are also known as controlled sources. The output voltage of a dependent voltage source is controlled by another voltage or current in the circuit.
Voltage-controlled voltage source: In a voltage-controlled voltage source, the output voltage is controlled by the voltage across another component.
Current-controlled voltage source: The output voltage is controlled by the current in another component.
Voltage-controlled current source: The output current is controlled by the voltage across another part of the circuit.
Current-controlled current source: The output current is controlled by the current across another component.
The voltage and current sources are classified by the resistance in the circuit.
Ideal source: The independent sources, which are considered to have zero internal resistance for voltage sources or infinite resistance for current sources, are known as ideal sources.
Ideal voltage source: An ideal voltage source is a voltage source that provides a voltage that does not depend on the current flowing through it.
Practical sources: The independent sources that have a value of internal resistance are called practical sources.
The voltage and current sources are classified by the type of current they provide.
AC source: means alternating current source.
DC source: means direct current source.
CONCLUSION
This article provides you knowledge about the types of sources in an electric circuit. Keep visiting our website to learn more about many topics of electrical engineering. This article is about the basics of electrical energy.
Thank you for the explanation.