Electrical Theory

Capacitance

A capacitor has two metallic plates or any other electrical conductors. These two conductors are arranged parallel to each other and are separated by space between them. Here the space serves as non-conducting medium.

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These two plates are joined with a battery. The whole arrangement is known as capacitor. Capacitance (C ) measures ability of a capacitor to store charge. Here charge build up is seen on both metallic plates. This charge builds up produce voltage between the two plates. The voltage, thus produced, makes the battery to serve as charge carrier between the two metallic plates. The process continues until the battery voltage becomes equal to the voltage.
It can be expressed as following equation:
 C=Q/V
Here C= capacitance
Q=charge magnitude on each plate
V=voltage on plates
The SI unit of C is Farad. As we know that SI unit of Q is Coulomb and that of V is volt. Hence
Farad= Coulomb/volt

Electrical Circuit

Electrical circuit (EC) can be understood by a simple assumption. Let’s think about two oppositely charged metal plates that are lying parallel to each other. Since the plates are oppositely charged and electrical conductive, an electric field will be generated between them. Due to this field, there will be movement of charge from positively charged plate to the negative one. Now consider that these two plates are connected by a metal wire.

This metal wire will serve as charge carrier from positive plate to the negative one. To establish a continuous loop of charge flow, a battery back is used. The batter pack serves to establish a continuous close loop of charge flow; it allows the charge to flow from positive plate toward the negative one and then back to the positive one. Hence an EC is the close continuous loop of charge flow.
Electric Circuits
To establish an EC, a continuous charge flow from and back to the source is required. For the purpose EC has some common components namely electricity source, conductor, control device and load device.

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Circuit Analysis

Circuit analysis relies on two laws namely Kirchhoff’s current law and Kirchhoff’s voltage law. According to the Kirchhoff’s current law, sum of all the currents entering and leaving a node is equals to each other, both values are zero. According to the Kirchhoff’s voltage law, sum of voltage drop around a loop is zero and sum of voltage rise around a loop is also zero.

Equivalent Resistance

It determines if two resistors are in parallel position or are present in a series.