#### Basics of Electrical Engineering

In electrical engineering stream, we are often interested in learning or transferring energy from one point to another. To do this, it requires an interconnection of electrical devices. Such interconnection is termed to as an electric circuit, & each component of the circuit is called as an element.

What is electric circuit: An electric circuit is an interconnection of electrical elements.

Various Circuit Variables are given below:

a. Charge: The key concept of electric charge is the fundamental principle for all electrical phenomena. Charge is an electrical property of the atomic particles of which matter consists, measured in coulombs (C).

b. Current: The time rate of change of charge, which is measured in amperes (A). Mathematically,

I(t) = dq(t)/dt

There are two types of current:  1. Direct current (DC)   2. Alternative current (AC)

c. Power: time rate of expending or you can say absorbing energy, which is measured in watts (W). Mathematically, the instantaneous power given by equation

P = dw/dt  = (dw/dq)(dq/dt) = vi

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