Rev. Notes > IGCSE > Elecrical Quantities Previous Topic Elecrical Quantities Next Topic Topics
 Electric charge One Coulomb Charge Production of electric charge Detection of electric charge Experiment to detect the electric charge Electrical conductors and insulators Electric field Electrostatic forces Application of electrostatic forces Electric current One Ampere of electric current Direction of electric current Basic relation of electric current Direct current Alternating current Ammeter Electromotive force - (e.m.f.) Potential difference One Volt Explanation of potential difference Measurement of potential difference Voltmeter Resistance Affect of length of the conductor on resistance Affect of cross-sectional area on resistance Affect of temeprature on resistance How nature of material affects the eresistance Ohm's law Potential difference - Current graph for Ohmic conductors Potential difference - Current graph for tungsten filament Potential difference - Current graph for semiconductor diode Electrical energy Formula for electrical energy Electrical Power Formulae for electrical power

## Electric charge

All atoms are made up of three kind of particles electrons , protons, and neutrons.

Electrons are the tiniest of these, and have a negative charge (1.6 X 10-19 C).

Protons and neutrons have about the same mass, but protons are poitively charged , while neutrons have no charge.

The amount of charge on an object is measured in Coulombs

In neutral atom, the number of elecrons and protons are equal, so having no net charge.

If there are more electrons than protons in an atom, then the atom carries an overall negative charge.

If there are fewer electrons than protons, then the atom carries an overall positive charge.

-----------------------

-----------------------

 Add Comment | FAQs | Report Error | | |

View Comments on this Chapter - Total Comments (6)

 sree Said : wish these had a diagrams 24/12/15 10:01 AM

 student 567 Said : There are no diagrams, but seeing that you don't give a shit... why should i bother to comment?! Can you just put the dam diagram up already! 18/04/14 08:10 PM

 Deepak varun Said : there is a spelling mistake to say said they said asaid please change it admin 17/11/13 06:26 AM

 gargi sachdev Said : diagrams aren't there ... 29/08/12 12:35 AM

 gargi sachdev Said : diagrams aren't there ... 29/08/12 12:35 AM

 Ajay Said : I cant see any diagrams? can u help me with it------------------------------------------------------------------------------------- Admin Replied: Hi Ajay, thank you for informing us about this issue. We will make sure we make those images available for you as soon as possible. Thank you 15/03/12 12:13 PM

# About us:

A team of committed professionals providing online resources of physics for the learners of IGCSE/AS/ A Level .....