Home // Electricity
PPT : All of us agree the importance of electricity in our daily lives
Content Inside :
A very highly simplified model of an atom has most of the mass in a small, dense center called the nucleus. The nucleus has positively charged protons and neutral neutrons. Negatively charged electrons move around the nucleus at much greater distance. Ordinary atoms are neutral because there is a balance between the number of positively charged protons and negatively charged electrons.
o Electrostatic Charge:
+ Electrons move from atom to atom to create ions.
# positively charge ions result from the loss of electrons and are called cations.
# Negatively charge ions result from the gain of electrons and are called anions.
(A) A neutral atom has no net charge because the numbers of electrons and protons are balanced.
(B) Removing an electron produces a net positive charge; the charged atom is called a positive ion (cation).
(C) The addition of an electron produces a net negative charge and a negative ion (anion).
Arbitrary numbers of protons (+) and electrons (-) on a comb and in hair (A) before and
(B) after combing. Combing transfers electrons from the hair to the comb by friction, resulting in a negative charge on the comb and a positive charge on the hair.
+ The charge on an ion is called an electrostatic charge.
+ An object becomes electrostatically charged by
# Friction,which transfers electrons between two objects in contact,
# Contact with a charged body which results in the transfer of electrons,
# Induction which produces a charge redistribution of electrons in a material.
Charging by induction: The comb has become charged by friction, acquiring an excess of electrons. The paper (A) normally has a random distribution of (+) and (-) charges.
(B) When the charged comb is held close to the paper, there is a reorientation of charges because of the repulsion of the charges. This leaves a net positive charge on the side close to the comb, and since unlike charges attract, the paper is attracted to the comb.
o Electrical Conductors and Insulators:
+ Electrical conductors are materials that can move electrons easily.
# Good conductors include metals. Copper is the best electrical conductor.
+ Electrical nonconductors (insulators) are materials that do not move electrons easily.
# Examples are wood, rubber etc.
+ Semiconductors are materials that sometimes behave as conductors and sometimes behave as insulators.
My be you need full description for PPT : All of us agree the importance of electricity in our daily lives, you can download this PPT : All of us agree the importance of electricity in our daily lives or online view this PPT : All of us agree the importance of electricity in our daily lives document. This PPT : All of us agree the importance of electricity in our daily lives powerpoint presentation available from category Electricity. Download Seminar Paper Powerpoint Presentation PPT : All of us agree the importance of electricity in our daily lives PPT slide and get information about PPT : All of us agree the importance of electricity in our daily lives.
Category : ElectricitySource : www.augusta.k12.wi.us
File Size : 1 Mb
Language : English
Online View : Preview
Download : 175 times
Share this info:
Tags: electrical conductors and insulators, electrons and protons, neutral neutrons, protons and electrons