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MTEL General Curriculum Part 11
Terms in this set (43)
How can you demonstrate the concept of static electricity due to friction?
glass rod and a plastic rod
glass rod rubbed with silk - positive charge
plastic rod rubbed with fur - negative charge
attractive force between the electrons and the nucleus
force is directly proportional to the product of the charge magnitudes and inversely proportional to the square of the distance between the two objects
positive charge or a negative charge creates a field of sorts in empty space around it, which is known as an electric field
How is electric charge measured?
materials that prevent the movement of electrical charges, while conductors are materials that allow the movement of electrical charges
a neutral conductive material can become charged by a positively or negatively charged object
Charging by conduction
similar to charging by induction
transferring charge actually touches the material receiving the charge
negatively or positively charged object is touched by an object with a neutral charge
electrostatic potential or voltage
expression of potential energy per unit of charge
What is the formula for voltage in a scalar quantity?
V = E/Q
E= potential energy
Q = charge
sustained flow of electrons that are part of an electric charge moving along a path in a circuit
Static Electric Charge
constant non-moving charge (NOT a continuous flow)
How is the rate of flow of electric charge expressed?
by an ampere and can be measured using an ammeter
How do you get charges to flow into a high potential area
connect it to an area of higher potential, by introducing a battery or other voltage source
When do electric currents experience resistance?
as they travel through a circuit
measurement of electric resistance
I=V/R current flow (I) through an object is equal to the potential difference from one side to the other
piece of metal that can affect another substance within its field of force that has like characteristics
What can magnets do?
attract or repel substances
How many poles do magnets have? What are they?
North and South
What is the rule with magnetic poles
the same poles repel each other and opposite poles attract
set of invisible lines representing the paths of attraction and repulsion
When can magnetism occur?
naturally or ferromagnetic materials can be magnetized
What produces a magnetic field?
motions of subatomic structure
the strength of a magnetic field
have energy and can transfer energy when they interact with matter
transfer energy but not matter
Important attributes of waves
measure of how often particles in a medium vibrate when a pave passes through the medium with respect to a certain point or node
measure of how long it takes to complete a cycle
refers to how fast or slow a wave travels
maximum amount of displacement of a particle in a medium from its rest position and corresponds to the amount of energy carried by the wave
point at which there is neither positive or negative displacement
peak, at which a wave's positive or negative displacement from the rest position reaches its maximum
point at which a wave's negative or downward displacement from the rest position is at its maximum
complete wave cycle
measured from crest to crest
one compression and one rarefaction
pressure disturbance that moves through a medium in the form of mechanical waves, which transfer energy from one particle to the next
frequency and wavelength
portion of the electromagnetic spectrum that is visible because of its ability to stimulate the retina
absorbed and emitted by electrons, atoms, and molecules that move from one energy level to another
What happens when light waves encounter an object?
they are reflected, transmitted, or absorbed
light, angle at which it contacts the surface will be the same angle at which it leaves, on the other side of the perpendicular
light, direction may be altered upon entering the object (REFRACTION)
stored as heat
bending of waves around small objects and spreading out of waves past small openings
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