DC Circuit. And there types.

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 Definition :


 Direct current.

                The current that always flow in one direction is called direct current.

The current supplied by A cell , battery or generator.



D.C. Circuit.


The closed path followed by direct current is called a d.c. circuit. A d.c. circuit essentially consist of a source of direct voltage (e.g battery), the conductors used to carry current and the load.

 Shows a figure.

A bulb connected to a battery through conducting wires. The direct current Starts from positive terminal of the battery 🔋🔋🔋

And comes back to the starting point via the load.



Types of DC circuit


1 Resistors in Series

2 Resistors in Parallel

3 DC Series Parallel Circuit


1. Resistor in series


 A number of resistors are said to be connected in series if the same current flows through each resistor and there is only one path for the current flow through out .consider three resistors of resistance R1, R2 and R3 connected in series across a battery of E volts .

The total resistance Rt is show


RT  =  R1 + R2 + R3

The Resistance is equal to the sum of the individual Resistance.


2.  Resistors in Parallel

A number of resistors are said to be connected in parallel if voltage across each resistor is the same and there are as many paths for current as the number of resistors.
Consider three resistors of resistance R1, R2 and R3 connected in parallel across a battery of E volts.


3. D.C. Series Parallel Circuit

This circuit is a combination of series and parallel circuit.
A simple example of such a circuit is illustrated.




Equivalent Resistance

The equivalent resistance of a circuit  or network between it's any two points is that single resistance which can replace the entire circuit between these points or terminal.



Kirchhoff's laws


1.   Kirchhoff's current law

The algebraic sum of the currents meeting at a junction in an electrical circuit is zero.


2. Kirchhoff's voltage law.

In any closed Electrical circuit or mesh , the algebraic sum of the electromotive force and voltage drops Resistors is equal to zero.

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