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Introduction to Circuit Theory

By using the circuit theory, a work is accomplished by routing the matter through a loop. There are various categories of matter used. Electronic and electrical circuits use electrons and charged ions which can be both positive and negative. The pneumatic circuit uses compressed gas which is normally the ordinary air. The hydraulic circuits are run by relatively incompressible and pressurized fluid. In magnetic circuits, a magnetic flux is channeled through the couple magnetic core.

Every kind of circuit has essentially three basic components. The active components form the sources of energy. The transmission lines have control devices (this part is optional). The passive components carry the load. An electric circuit accomplishes a certain task, like lighting, heating or running a motor. It has a collection of electrical components which do these tasks successfully. Whether the components form a topological loop or not depends on whether or not they are connected to power and/or integrated with a larger circuit or device. The components can be also damaged. Omission of the return paths from the circuit diagrams causes the resulting graphic to visually resemble a network topology which is different form a loop typology. When the return path is de-emphasized, the electrical circuit can also be termed as network.

The circuit analyses depend fundamentally on the aspect of the matter following the return path to the power source. If the matter gets prevented and does not return to the power source, wholly or partially, the work could not be completed by the entire assemblage. An open circuit is caused intentionally in an electrical circuit by the user opening a switch intentionally and also unintentionally when a wire is severed by a vibration or mechanical damage. In case of a hydraulic or pneumatic circuit, this is found when a valve is closed or one of the lines or components leak. The term completing the circuit is creating a close loop for the electrons to flow through when a switch is closed in electrical circuits.

Many a times an unintended connection is made in the electronic circuit by the breaking, fraying, melting or chewing of insulation by rodents and also when the technician inserts a metal tool in the live device accidentally. This causes the current to bypass all or some components in the circuit. The current then takes a shorter path to the power source. This causes excessive current drain, generating excessive heat. This heat destroys or damages some sensitive parts of the system like the IC’s or transistors.

There are basically four types of circuits

Electronic circuit- It comprises of the individual electronic components such as capacitors, diodes, inductors, and transistors etc which are connected to each other by conductive wires through which the electric current flows. The electronic circuit has various sources of energies like batteries, generators, solar cells etc and the transmission lines are through wires and switches.

Pneumatic circuit- It converts the compressed gas to mechanical work by using its interconnected set of components. Compressor is the most widely used source of energy and the transmission lines are air tanks, valves, pneumatic hoses and open atmosphere also.

The Hydraulic circuit- The transportation of liquid is done in this type of circuit by a set of discrete components which are interconnected. Power packs are the sources of energies for hydraulic circuits which run on the transmission lines of hydraulic hoses.

Magnetic circuit- magnetic cores are used for generating and transporting current. Magnetic fields are the sources of energies for these types of circuits.

A closed circuit has a complete connection between the terminals by the help of a series of devices. An open circuit is only a section of circuit with no connection between the terminals. The circuits current and voltages etc are measured by using volt meters and ammeters respectively.