Topic 2 Static Electricty Flashcards
Why’d shocks and sparks happen
Static electricity are charges not free to move causing them to build up in one place until they finally move
What happens when certain insulating materials are rubbed together
Negatively charged electrons are scrapped off one and dumped onto the other
What does this friction leave the materials with
A positive static charge on one and a negative static charge on the other
Shat does the way the electrons are transferred rely on
The two materials involved
Examples of static caused by friction
Polythene negative when rubbed
Acetate positive when rubbed
How are ions created
Loss or gain of electrons
Why does a material have a positive charge
Electrons are lost which means it loses some negative charge and is left with an equal positive charge
Why do we get shocked/ sparked
As electric charge builds on an object the pd between object and earth (0v) increases
When pd gets large enough electrons can jump across the gap between the charged object and the earth causing spark
Can also jump to earth conductor which is why we get static shocks
Usually happens when small
What happens when two electrically charged forces are brought close together
They exert a force on one another
Rules for attraction
Opposites attract
Two of the same repel
What happens when the things get further apart
The forces get weaker
What is it called when these forces cause an object to move
Electrostatic attraction / repulsion
What is electrostatic attraction / repulsion
A non contact force
Way to see electrostatic force
Suspend rod with known charge from piece of string place object with same charge nearby and will repel and move away
