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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.

各种电路的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.

电路分析从根本上取决于返回电源的返回路径之后的物质方面。如果该问题被阻止并且不完全或部分返回电源，则整个组合无法完成工作。用户故意在电路中有意且无意间通过振动或机械损坏切断电线时，故意和无意间打开开关。如果有液压或气动电路，则在关闭阀门或一条线或组件泄漏时发现这一点。完成电路的术语是在电路中关闭开关时会创建一个近距离循环。

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.

气动电路 - 它使用其互连组件集将压缩气体转换为机械工作。压缩机是最广泛使用的能源，传输线是空气箱，阀门，气动软管和开放的气氛。

液压电路 - 液体的运输是在这种类型的电路中通过一组互连的离散组件进行的。功率包是在液压软管传输线上运行的液压电路的能量来源。

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.