A circuit is a path which electrons from a voltage or current source flow. Electric current flows in a closed path electric circuit. The point at where electrons enter a circuit is called the source of electrons. The point at which the electrons leave the circuit is called the return or earth ground. The part of a circuit which is between the electrons’ staring point and the point where they return to the source is called an electrical circuit load.
Electrical circuits usually use alternative current (AC) sources. The load may be as simple as those of electrical appliances like refrigerators or quite complicated loads such as hydroelectric power generating stations.
Electronic circuits use low voltage direction current (DC) sources. The load of an electronic circuit may be as simple as a few resistors, capacitors and a lamp all connected together when creating a digital camera, or as complicated as connecting thousands of resistors, capacitors and a transistor to create a microprocessors.
Circuits can be complicated. However, they can be modeled by drawing the connections of all the component parts in the circuit’s load which makes it easier to understand. Drawing the electronic circuits are called a circuit diagram. Drawing electrical circuits are called a wiring diagram.