An inductor is a passive two terminal element designed to store energy in its magnetic field. Inductor also called reactor or coil. It consists of conductor like wire wound into a coil. When current passing through the coil, energy is stored temporarily into the magnetic field. Applications of inductor in our daily life are transformers, power supplies, TVs, radios, radars etc.

A capacitor is an element which stores charges. It is a passive element as it stores energy. Michael Faraday invented capacitor. The unit of capacitance is Farad was the name of honor of Michael Faraday. In electronics, communication, power systems, computer etc field capacitors are extensively used. In circuit capacitor in an important circuit element, its role can not be described in words.

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Linear property is the linear relationship between cause and effect of an element. This property gives linear and nonlinear circuit definition. The property can be applied in various circuit elements. The homogeneity (scaling) property and the additivity property are both the combination of linearity property.

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Sometimes we are not sure in electric circuits that the resistors are neither in parallel nor in series.

See the circuit below here the relation between R_{1} resistor and R_{6} resistor is series or parallel we are not sure.

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When a circuit has two or more independent sources, we can determine the contribution of each source applying nodal analysis or mesh analysis. Another way is to find out the contribution of the independent sources (voltage or current) is to apply superposition theorem.

Superposition theorem is based on circuit linearity property.

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Circuit theory is important for electrical engineering, physical science, networking. Circuit theory is the fundamental of electrical engineering. Every electrical engineering students should have clear concept about circuit. We transfer electrical energy one place to another through circuit. In our houses we use different types of circuit for using fan, bulb, iron, fridge, micro oven etc. Before understanding circuit we have must knowledge about circuit element. Each component in a circuit is known as circuit element. Battery, resistor, wire, capacitor, inductor etc are circuit element. See below some practical circuit element

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**How to solve circuit**

If you follow the procedure solving a circuit it will be easy. Follow below steps solving electrical circuits.

**Step 1:** Define the problem.

**Step 2**: Present everything what you know about that circuit.

**Step 3: **Think how many alternative solution can be possible. Pick one which is the easiest and give correct answer.

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Mesh analysis is a circuit solving procedure using mesh current. In nodal analysis we apply KCL to find unknown voltages. But here using KVL we will find unknown currents using this method. We will use mesh currents instead of element current. Mesh analysis reduces the equations getting current. Nodal analysis can be applied in each general circuit but mesh analysis cannot be applied in each general circuit. Mesh analysis only be applied if the circuit is planer.