WEEK ONE NOTES Flashcards
What is conduction?
The movement of electrons
What are conductors?
Materials that accept the flow of electrons/ electricity from other atoms
What is the equation for electrical charge?
Q = I x t
What is electrical current?
The rate of flow of electrical charges/ electrons
What is the equation for electric current?
I = Q/t
What is potential difference?
The energy required to move electricity
What are some sources of e.m.f?
Batteries or generators
What energy does a battery use to make an emf?
Chemical
What energy does a generator use to make an emf?
Converts mechanical energy into emf via magnetic and electrical fields
What is the equation for current?
I = V/R
What are insulators?
Materials that prevent the flow of electrons.
Have 5 or more electrons in valence shell
What is as semi-conductor?
Materials that can be changed to act as a conductor or insulator.
4 electrons in valence shell
When is an electrical charge produced?
When there is too many or too few electrons in an atom
What is ionization?
The process of loosing or gaining electrons
What is an ion?
An atom that has lost or gained an electron
Describe the neutral state of an atom
They have little attraction to other atoms.
If these atoms get too close they may share electrons/form bonds
Describe the ionized state of an atom.
An ionized atom is an ion, they have a strong attraction to other atoms, due to the strong electric field.
What force do electric fields exert?
Coulomb force
What is an electric field?
Produced by protons and electrons.
It is a region where charges experience a force.
What is electricity?
The movement of electrons between atoms
When is kinetic energy produced?
When an object moves
Where does potential energy result from?
An objects arrangement
What is potential difference also known as?
Voltage
What is 1 Volt equal to?
Its equal to 1 joules, 1 Coulomb etc
What is the equation for energy transferred?
E = QV
Energy in joules = charge x potential difference
What is ground/common?
The process of moving excess charge by providing a pathway back to the source or into the ground
What is the difference between the emf and voltage?
emf is the measure of energy supply whereas voltage is the energy used by one coulomb to move
What is the equation for emf?
emf (V) = E/Q
emf = energy/ charge
