What Is an Equivalent Circuit?

The equivalent circuit is also called "equivalent circuit". Under the same given conditions, it can replace another circuit with the same external performance. The electromagnetic processes of electrical equipment such as motors and transformers can be analyzed and studied with their corresponding equivalent circuits.

The so-called "equivalent" refers to replacing or transforming a complicated circuit or concept with a simple circuit or a known concept in order to simplify the circuit analysis while maintaining the effect of the circuit. This physical idea or analysis method is called Is the "equivalent" transformation. It should be noted that the concept of "equivalent" is only used in the theoretical analysis of circuits and is a concept in electrical engineering teaching. It is different from the concept of "replacement" in real circuits, that is, "equivalent" is only used in theoretical assumption , Not a "replacement" in real circuits. The purpose of "equivalent" is to simplify the analysis process during circuit analysis and make it easier to understand. ^[1]

1. In the circuit diagram, the wire resistance is regarded as zero, and the length can be arbitrarily extended and shortened, and the shape can be arbitrarily changed.

2. The voltmeter and ammeter are regarded as ideal electric meters (RV = , RA = 0). When drawing an equivalent circuit, short the ammeter with a wire to remove the voltmeter.

3. When a current flows through the resistor, the potential drops; when no current flows through the resistor, these two points are considered equipotential points. ^[5]