WEEK 1

It deals with the basic concept and fundamental laws of electrical circuit theory; analysis and application of series, parallel and series parallel resistive circuits; mesh and nodal analysis; network theorems;characteristics of inductors and capacitors; analysis of RL, RC and RLC circuit with DC excitation.



We should know the different terms use in DC circuits such as Current, Voltage, Resistance and Power.

Voltage- is commonly used as a short name for electrical potential difference. Its corresponding SI unit is the volt. It is electrical driving force that drives a conventional electric current.
Current- a flow of electric charge or the rate of flow of electric charge . This flowing electric charge is typically carried by moving electron in a conductor.
Power- is defined as the rate at which electrical energy is transferred by an electrical circuit. The SI unit of power is the watt.

Electrical resistivity is a measure of how strongly a material opposes the flow of electrical current. A low resistivity indicates a material that readily allows the movement of electricalcharge The SI unit of electrical resistivity is the ohm metre(Ω m).

The electrical resistivity ρ can also be given by,

where

ρ is the static resistivity (measured in ohm-metres, Ω m);

R is the electrical resistance of a uniform specimen of the material (measured in ohms Ω);

l is the length of the piece of material (measured in meters ,m);

A is the cross-sectional area of the specimen (measured in square metres, m²).

DC electrical circuit components


Resistors- is a two-terminal electronic component that produces a voltage across its terminals that is proportional to the electric current passing through it.


Inductor - is a passive electrical component that can store energy in a magnetic field created by the electric current passing through it.



Capacitors- is a passive electronic component consisting of a pair of conductors separated by a dielectric (insulator).



Switches- electrical component that can break an electrical circuit, interrupting the current or diverting it from one conductor to another.