term 3 study Flashcards
what is friction
the rubbing of two materials causing the transfer of electrons between the atoms of two materials.
what is static electricity
a stationary electric charge, typically produced by friction
state the meaning of electric charge
positive or negative property of a particle or object
determine the meaning of electric shock
response to the passing of electricity through the body.
discuss what is lightning
the occurrence of a natural electrical discharge of very short duration and high voltage between a cloud and the ground or within a cloud
what causes lightning
thunderstorm when liquid and ice particles in a cloud collide and electrons transferrer between them
4 ways to prevent lightning
stay away from trees
do not run
avoid using a landline
avoid using a cellphone
what is a circuit
pathway through were electricity can move
what does a resistor do in circuit
an electrical component that limits or regulates the flow of electrical current in an electronic circuit
state the definition of electric charges
flow of electric charge in a circuit
key definition of these words :
visible light
luminous
ray diagram
visible light - type of energy that comes from light sources
luminous- word that describes object that gives of light .
ray diagram -diagram that uses arrowheads to show path of ray of light
what happens to the resistance in a series circuit?
the total resistance increases
definition of wave
A pattern created by up and down movement or side to side movement
wave length
length of one wave pattern
Frequency
number of complete waves that move past certain
definition of normal
imaginary line reflective surface that is perpendicular to the surface.
state what kind of light is the incident ray
this is the light that travels to the reflective surface .
state what the reflective ray is reflected by
this light is reflected the reflective surface .
state what is the cornea
protective front covering of the eye
state what is the retina
the back of the eye where all the light that enters the eye and where image is formed
state what is the pupil
hole in centre of the iris that control the amount of light that enters the light
optic nerve
part of the eye that transmits from the retina to the brain
