3.2 Static Electricity And Conduction Flashcards
How can static electricity be generated?
Through contact, friction, or induction
Do all materials contain both positive and negative charges?
Yes
In all materials how are all the charges arranged if no overall charge is detectable?
They’re distributed evenly
When positive and negative charges are unevenly distributed what is created?
Static electricity
What methods are used to create static electricity?
Contact, friction, or induction
When rubbing two materials together what will happen to the electrons?
They move from one material to the other
What type of electrical charges attract to each other?
Opposites attract - +
What type of electrons repel from each other?
Same like charges + + or - -
What is Coulomb’s law?
It describes the force between two electrically charged bodies
Why is Coulomb’s law used?
To calculate the force of attraction between two particles, one negative and one positive
Using the standard SI units, What is force (F) measured in?
Newtons (N)
Using the standard SI units, What is charge (Q) measured in?
Coulombs (C)
Using the standard SI units, what is distance (d) measured in?
Metres (m)
Why are metals good conductors of electricity?
They have a lot of free electros available for conduction
When applying an electrostatic force to a metal what will happen to the free electrons?
They will flow from the negative to the positive pole
Is it true or false that all solids will conduct electricity to some extent?
Yes it is true
When an electron enters a conductor what happens at the opposite end?
Another electron is pushed out causing electric current
If the current remains constant what will also stay the same even if the cross-sectional area changes?
The same number of electrons per second will flow through the conductor
True or false, Chemically pure water is a poor conductor?
True
When an electric current passes through water what happens?
It decomposes the water which produces hydrogen and oxygen
What happens when you apply direct current to water?
It will generate hydrogen at the negative pole and oxygen at the positive pole
What is added to make water a better conductor?
Acids, bases, or salts
When adding things to water to make it a better conductor, what happens to the compounds in the solution?
They decompose more readily (example is salty sea water corrodes metal faster than rain)
The decomposition of chemical compounds by passing an electric current through a liquid is called?
Electrolysis
When the process of electrolysis is happening what is the conducting substance (normally salty water) called?
An electrolyte
What is electrolysis used for?
Charging batteries or electroplating
What is the conduction of electricity by gases called?
Gas discharge
What is electron cascade?
When electrons and gas atom collide to produces more electrons which rapidly set more off next to each other
In principle no substance’s available can carry charges across a vacuum, why is this?
Because by definition a vacuum contains no particles
Why are electron beam oscilloscopes used?
Easy to operate, versatile, and shock resistant
What is a cathode?
A negatively charged object
What is an anode?
A positively charged object
What is a Braun tube used for?
To show that it is possible to have a current in a vacuum
When current flows through an electrolyte what carries the charge?
Ions
