AC Circuit Phase Sequence

Phase sequence is the order in which the generated voltages in the phase winding of an alternator reach or  attain  their peak or maximum values. It is represented by the letters a, b, and c or the numbers 1, 2, 3 or by using double letter as ab, bc  and ca or  an, bn  and...

Balanced Three phase AC circuit Delta connected

A balanced three phase AC circuit systems is energized by three equal alternating emf's of the same frequency but 120 degree apart. The phase impedance are equal. Also the currents are equal and 120 degree apart. Three AC emf's differing in time phase by 120 degree DELTA (MESH) CONNECTED SYSTEM This...

Electronics :Traffic light Circuit

This is a two way continuous traffic light circuit which uses  LED, diodes and IC's .  Usually most traffic light in the world is PLC controlled but this circuit is  simple  and easy to build .   In the image below is the schematic diagram of the project ....

Plane Geometry Review : Triangle Area calculation

Area Formulas 1.  Given base and altitude Triangle: Given base and height Area = 1/2 (b)(h) 2. Given two sides and an Angle  Triangle:  Given 2 sides and angle Area = 1/2 (a) (b)sin θ 3. Given 3 sides Triangle Given 3 sides a,b,c Area = sqrt (s(s-a)(s-b)(s-c))----->...

Engineering Mathematics : Plane Geometry Part 1

Fundamental Principles Angles Acute angle = less 90 deg Obtuse angle = more than 90 and less than 180 deg Straight angle =180 deg Vertex of the angle is point where two lines meet Supplementary angles have a sum of 180 deg Complementary angles have a sum of 90 deg The base angles of an isosceles (two...