In this tutorial, we are going to learn about **DC Circuit.**

## DC Circuit

Electrical circuit elements (R, L & C), voltage and current source, Kirchoff current and voltage laws, analysis of simple circuit with DC excitation Superposition, Thevenin and Norton Theorem, time-domain analysis of first-order – example, RL and RC circuit.

## R – Resistance

It is the opposition offered by a material to the flow of electric current and Ohm is the measurement unit of resistance. It is measurement symbol is Ὠ, KὨ and MὨ.

**L – Inductance **

It is a device that store energy in a magnetic field, It resists change in current and Henry (H) is the measurement unit of inductance.

**C – Capacitor**

It is a device that stores electrical energy in an electric field. It is a passive electronic component that has two terminals. The effect of a capacitor is known as capacitance and Farad (F) is the measurement unit of the capacitor.

**Electrical Energy Source**– Voltage Source and Current Source.**Voltage Source**– Ideal Voltage and Practical Voltage.**Current Source**– Ideal Current and Practical Current.**Idea Voltage Source**– It is a device which produce a constant voltage across its terminal, no matter what amount of current drawn from it , example – terminal voltage is independent of load resistance.

**Practical Voltage Source**– In practical voltage source as the load resistance R_{L }connected across the source is decreased, the corresponding load current I_{L }up, while the terminal voltage across the source down.

**Ideal Current Source**– It is a device which delivers a constant current to any load resistance connected across it, no matter what the terminal voltage is developed across the load, Example – independent of voltage across its terminal across the terminals.

**Practical Current Source**– It is device which has two terminal devices have the some resistance connected across its terminals. Mostly ideal current source, the output current depends on the voltage of the source.