Electricity Flashcards
(25 cards)
Electricity
Electric energy transfer be the motion or flow of electrons
Types of materials
Semiconductors
Insulators
Conductors
Superconductors
Conductors
Materials that can transfer electric charge
Insulators
Material that cannot transfer electric charge
Semiconductors
Act sometimes as conductors and sometimes as insulators
Superconductors
The fastest conductors using critical temperatures
Two types of charge
Attractive and repulsive
Grounding
Establishing a connection to earth to neutralize an object
Conservation of charge
In an isolated system the total charge is conserved
Electric potential energy
Work done in bringing a charge object from some zero reference location to a particular point in space
Electric charge
A vector field with size and direction at each point space.
The electroscope
Gives easily observe results when something is charged
Electric force
It’s size depends on the distance of the charged objects
Coulomb’s law
Relationships between two electric charges and their distance.
Electric field
Area of influence where electrons are moving.
Is a vector that can be represented with electric field lines pointed in the direction of the force exerted
Electric field lines
A representation of the electric field in a region of space.
Lightning
The production of the lightning bolt begins when a separation of electric charges develop on the clouds. In the ground the positively charged region moves up through any contacting objects. Then both positive charges of the ground and clouds form a complete circuit and the lightning begins
Ohm’s law
The resistance of an object is equal to the voltage across it divided by the current through it
Parallel and Series
Parallel: two circuit elements wired in parallel, when the current can flow through one or the other but not both, they are connected to each other at both terminals.
Series: arrangement of resistance on a single pathway so that current flows trough each element
Current
A flow of electric charge measured in amperes
Charging materials and it’s four parts
Ways in which objects can obtain electric charges.
Induction
Friction
Contact
Polarization
Induction
Electrons transferred without a physical contact passing through a small distance
Screen of tv
Friction
Transfer by rubbing. Needs to be always at contact
Rubbing 2 balloons
Contact
Transfer when an object is plugged onto the direct electric current
Electronic devices
