This document defines basic electrical terms and concepts and describes some of the key contributors to the development of electricity over the past 200+ years. It explains that conductors are substances that contain free electrons that allow the flow of electricity, such as copper and aluminum, while insulators do not contain free electrons and do not conduct electric current, like wood and rubber. It also defines electric current as the amount of charge passing through a conductor per unit time, measured in amperes, and electric potential and potential difference in terms of the work required to move electric charges between two points in an electric field.

1. •ELECTRICAL CHARGES
•CONDUCTORS/ INSULATORS
•BASIC DEFINATIONS
•ELECTRICAL COMPONENTS:
SYMBOLS

2. •‘ELECTRICITY’ IS THE FINDING OF
RESEARCH WORK OF SCIENTISTS
OVER 200 YEARS.
• OHM, AMPERE, VOLTA, THOMAS
ALVA EDISION, WILLIAM GILLBERT, J.J.
THOMSON, MICHAEL FARADAY ,
JOULE.. AND OTHERS HAS MAJOR
CONTRIBUTIONS IN RESARCH WORK..

4.  CONDUCTORS:
THE SUBSTANCES WHICH HAVE FREE
ELECTRONS INSIDE THEM CAN CONTRIBUTE
TO THE FLOW OF ELCTRICITY.. SUCH
SUBSTANCES ARE CALLED
CONDUCTORS..FOR EXAMPLE COPPER,
ALUM..
 INSULATORS:
THE SUBSTANCE WHICH CANNOT
CONDUCT ELECTRIC CURRENT ARE CALLED
INSULATORS. THEY DO NOT HAVE FREE
ELECTRON INSIDE.. FOR EG. WOOD,
RUBBER..

5.  ELECTRIC CURRENT:
AMOUNT OF CHARGE PASSING THROUGH
A CONDUCTOR AT ANY CROSS SECTION IN
UNIT TIME IS CALLED ELECTRIC CURRENT..
Symbol: I Unit: Ampere
I = charge/ time
= Q / t (IN c/sec= ampere

6.  ELECTRIC POTENTIAL:
ELECTRIC POTENTIAL = V = work done / charge
= W / Q (in J/C=V
Symbol: V Unit: V
 POTENTIAL DIFFERENCE:
THE POTENTIAL DIFFERENCE(P.D.) IS 1V IF THE
WORK DONE IN TAKING A UNIT POSITIVE CHARGE
FROM ONE POINT TO ANOTHER IN AN ELECTRIC
FIELD IS 1J, FOR THOSE TWO POINTS.