ELECTRICAL CIRCUITS
Basic Electrical Quantities
Electric current
Electric current in a wire is defined as the net amount of charge that passes
through the wire per unit time , and is measured in amperes (A).
Voltage
Voltage is the energy absorbed or expended as a unit charge moves from one
point to the other.
Electrical Power
Time rate of expending or absorbing energy and is measured by Watts.
Elements of electrical circuits
Active elements
Active elements are the elements that can generate energy or power, such as
voltage and current sources.
Passive elements
passive elements are the elements that can not generate energy, such as
resistors, capacitors and inductors.
Ohm’s Law
Ohm's law states that the current through a conductor between two points is
directly proportional to the potential difference or voltage across the two
points, and inversely proportional to the resistance between them
Resistors in Parallel
When the terminals of two or more circuit elements are connected to the
same two nodes, the circuit elements are said to be in parallel.