8th grade science Flashcards
Battery
A device that stores chemical energy and converts it to electrical energy
Watts
Unit of Power
Difference between parallel and series circuits
Parallel circuits - individual lights can go on and off
Series Circuits - All lights go off and all go on
What is the difference between endo-thermic and exo-thermic?
One releases, and one absorbs heat
Joule
Measure of capacity to do work or generate heat
Alternating currents
The values of the quantity and direction of the current are not constant. It changes at a regular interval
Current
Rate of flow of negative charges in an electric current
Electricity
A form of energy resulting from the existence in charged particle
Semiconductors
Conducts some things well and some bad
Transformers
The device that transfers electric energy from one current to another
Direct current
Electric current that flows consistently in one direction
Catalyst
Substance that changes the rate of the chemical reaction
Power
Rate at which energy is transferred
Law of conservation of Energy
Energy can not be created or destroyed only changed in form
Parallel circuit
Multiple branches for electricity to form
potential energy
The energy that comes from position or condition. The higher the object, the more potential energy it has
Electrodes
Good conductors of electricity that is usually connecting nonmetals
Ohm’s law
Voltage = residence * current
Voltage
Voltage is a measure of how difficult it is for electrons to flow through a material
circuit
A circuit is a complete circular path that electricity flows through.
Insulators
a material in which electrons can not move easily from place to place
conductors
Allow electrons to move through easily
ions
An atom or molecule with a net electric charge
Kinetic energy
Objects in motion has kinetic energy
