Thursday, 2 August 2012

this simulation shows the charging by friction and also the attraction of electrons
video    
created by Sabrina

Tuesday, 31 July 2012



Grounding-the Removal of a Charge

Grounding is a process of removing a charge from an object. It means that it transfers the electrical charge from an object to the ground making it neutral. Electroscope connected to a conducting pathway to another object that receive electron. This process works because electrons find another electrons. They repel each other. If the electroscope is positive charge, it will the electron from other object. So it’s become neutral. 
picture courtesy from: http://groundlevelsystems.com/electrical-ground-testing
            created by Roland
            edited by Ghani and Roland 


Charging by Conduction

Charging by conduction is a charge that involves a contact between a charge objects with a neutral object.
When the negative charges get in contact with the neutral charges. For example; when negative charges steel stick will get in contact with the neutral charge iron plate, the electron in the steel stick will move to the iron plate neutral zone area. It’s because electron repel each other or in other word the electrons are trying to stay as far as possible from the other electrons. So when there is a neutral charge area inside the iron plate the electrons will immediately move to the neutral charge area make the iron plate become negative charge due to number of negative charge exceeding the number of positive charges.
*click the option students and choose charging by induction
There also conduction for positive charge, even though the process is a bit different. For example there is positive charge steel ruler and a neutral charge iron plate. When both of them get in contact or touching each other, the proton in the ruler will start to attract the electrons in the plate. It’s because proton cannot move like electron but can attract the electrons to proton itself. It also decreases the number of electron on the plate making it a positive charge plate, due to the number of electrons has been decrease making it less than the proton.
picture courtesy from: 
http://www.physicsclassroom.com/class/estatics/u8l2c1.gif

video courtesy: fahyscience's channel 
http://www.youtube.com/watch?v=xClT7LIRmls
               created by Brainhart
               edited by Sabrina


Charging by Induction

Charging by induction is a method of charging an object without touching the object to any other charged object and using insulating objects to prevent any conduction other than the object that is being charged. Induction uses the process of polarization and insulation and a bit of conduction.
A common demonstration would be 2 metal balls and a charged object. The 2 metal objects are conductors and they have neutral charge. While for example, a negative charged balloon will polarize the metal balls and move the electrons from 1 ball to the other making positive and negative charge. The insulator stand will prevent the charge from going to the ground which will neutralize the charge.
Another demonstration that relates to the grounding system is nearly the same demonstration as the previous, but with only 1 metal ball, a charged balloon, and a grounding wire (your body/arm can be used as a grounding system as long as your feet are at the ground). The balloon can be charged in anyway, positive or negative. As the charged balloon polarizes the metal ball, the electron will move to the grounding wire/your arm and moves to the ground making the metal ball electric charged. If the balloon is a positive charged object then the metal ball will be a negative charged object, and vice versa. 


video courtesy: fahyscience's channel 

                created by Ghani
                edited by Sabrina

Charging by Friction

As it is explained, that all of the objects are made of different types of atoms and combination of different atoms. The presence of atoms give objects electrical behavior one of thee properties known as electron affinity, this behavior is referring to the amount of attraction force of one electron for one another, which is one of the process of charging, that is charging my friction or well known as rubbing.
For example of the charging by friction, balloon that is rubbed with our hair, the electrons that are stable in the balloon will be attracted to the ones in our hair, or it can be opposite that the electrons from our hair is attracted to the ones in the balloon, since either of the objects has lose or gain electrons, they will be more attracted to each other because the one that loses electrons, will become positive charge and the one who gained electrons will be negative charged. For example if we put then close to each other, the balloon will move and will be closer to our hair or the hair will go up to touch the balloon.
picture courtesy from: http://etorgerson.net/B10_Static.html
Frictional charging is a process that transfers electrons to the other object by rubbing them together, if one of the objects has greater attraction force, then the object will take the electrons of the weaker force. For the object that gains electrons will have excess of electrons and become negative charged because the number of electrons is too much and the one that loses becomes positive since the amount of proton is greater.

 
video courtesy: fahyscience's channel 

            created by Sabrina 
            edited by Sabrina