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8th Grade: Chapter 6: Electricity Lesson 1: Electric Charge and Static Electricity
Transcript of 8th Grade: Chapter 6: Electricity Lesson 1: Electric Charge and Static Electricity
The charge on a proton is (+).
The charge on an electron is (-).
If two electrons or two protons come close together, they push each other apart.
If a proton and an electron come close together, they attract one another because they have opposite electric charges. Charges Charges that are the same repel each other.
Charges that are different attract each other.
The interaction between electric charges is called electricity.
The force between charged objects is called electric force.
An electric field is a region around a charged object where the object's electric force is exerted on other charged objects.
Electric fields and forces get weaker the farther away they are from the charge. How Does Charge Build Up? The buildup of charges on an object is called static electricity.
In static electricity, charges build up on an object, but they do not flow continuously.
Charges are neither created not destroyed. This is a rule known as conservation of charge.
An object can't become charged by destroying or creating its own electrons.
If one object loses electrons, another object must pick them up.
There are four methods by which charges can redistribute themselves to build up static electricity.
The Four Methods 1. Friction
:is the transfer of electrons from one uncharged object to another by rubbing the objects together.
:is the transfer of electrons from one object to another by direct contact.
:electrons can react to electric fields of a charged object without touching the object itself.
4. Static Discharge
:the loss of static electricity as electric charges transfer from one object to another.
Static discharge often produces a spark. A little overview