Basic Concepts-Introduction

• Electric circuit theory and Electromagnetic theory are the two fundamentals theories upon which all branches of Electrical Engineering are built.
• Many branches of Electrical Engineering such as power, Electric machines, control, electronics, communications and instrumentation are based on electric circuit theory.

• In Electrical engineering, we are often interested in communicating or transferring energy from one point to another.
• To do this requires an interconnection of electrical devices. Such an interconnection is referred to as an Electric circuit, and each component of the circuit is known as Element.
• An Electric circuit is an interconnection of electrical elements.

Let us discuss about a Basic Simple Electric Circuit:

The above Electric circuit consists of three basic elements.

• A battery
• A lamp and
• A connecting wires.

Such a simple circuits can exist by itself . It has several applications  such as  flash light , and  so forth.

A Complicated Real Circuit:

• The above diagram represents the schematic diagram for a radio receiver.
• Although it seems to be complicated, this circuit can be analyzed using the techniques .