# Shared Flashcard Set

## Details

Electricity and magnetism
Electricity and Mangnetism
74
Physics
07/02/2013

Term
 What is the smallest unit of electrical charge?
Definition
 Electron
Term
 What is Direct current? D/C
Definition
 The electrons flow at a steady stream in one single direction. For example: Battery
Term
 What is alternating current?
Definition
 The individual electrons actually oscillate or "Vibrate" back and forth. Example: Generators.
Term
 Electrostatic force is _____ proportional to the distance between charges and ____ proportional to the product of the charges.
Definition
 Inversely, Directly
Term
 The charges on an object are distributed how?
Definition
 evenly throughout the object
Term
 On the surface on an electrified object, the charges concentrate
Definition
 On the sharpest curvature
Term
 What is the unit of electric potential?
Definition
 Volt
Term
 What is the unit of electrical current?
Definition
 Ampere
Term
 What is the unit of electrical resistance?
Definition
 Ohm
Term
 If the distance between two UNLIKE charges is doubled, The force of attraction is
Definition
 four times less
Term
 The distance between two LIKE charges is cut in half. The force of repulsion is
Definition
 four times more
Term
 What is the relationship between current and potential difference?What is this relationship Called?
Definition
 they're directly proportionalOhms Law
Term
 What is the formula for Ohms Law
Definition
 V=RI where R is in units Ohms
Term
 All moving electric charges develop
Definition
 Magnetic fields around them
Term
 If the charged particle spins counterclockwise the North pole will point
Definition
 Upward
Term
 If the charged particle spin clockwise the North pole will point
Definition
 Downward
Term
 The direction of spin determines the orientation of the magnetic field, this is called:
Definition
 Magnetic Moment
Term
 Regions in which the atoms tend to line up their magnetic dipoles is called:
Definition
 Magnetic Domains
Term
 An entire atom with a magnetic field is a:
Definition
 Magnetic dipole
Term
 Easily magnetized-high permeability Ex: IronPermanent magnets are made of this
Definition
 Ferromagnetic
Term
 Weakly repelled by a magnet
Definition
 Diamagnetic
Term
 Slightly attracted by a magnet- low permeabilityHas a High retentivity
Definition
 Paramagnetic
Term
 A materials ability to be magnetized or demagnetized
Definition
 Permeability
Term
 The ability to stay magnetized or to be UN-magnetized
Definition
 Retentivity
Term
 Permeability and retentivity are_____ proportional
Definition
 Inversely
Term
 The unit of measure for the strength of a magnetic field
Definition
 Tesla
Term
 A magnetic field is creted when they get close to each other and become Influenced by a strong charge is called:
Definition
 Electromagnetic Induction
Term
 The study of fixed electrons at rest (stationary) on and in objects
Definition
 Electrostatics
Term
 Two electrified objects with like electrostatic charges _____each other
Definition
 Repel
Term
 Electrostatic force is measured in units of
Definition
 Coulombs
Term
 What is the effect on electrostatic force of either repulsion or attraction between two objects when the distnance between them increases
Definition
 Force will decrease
Term
 Where do electric charges distribute in material that is a conductor of electricity
Definition
 On external surface
Term
 Electrification done when one object rubs against another object
Definition
 Friction
Term
 When two object touch one another permitting electrons to move to the other
Definition
 Cunduction/Contact
Term
 Electric fields act on one another without contact. Influence
Definition
 Induction
Term
 The study of electrons moving through a conductor such as a copper wire is termed
Definition
 Electrodynamics
Term
 The actual flow of electrons in a conductor:
Definition
 Current
Term
 Property of an element in a circuit that resists or impedes the flow of electricity
Definition
 Resistance
Term
 electrostatic force between 2 properties is _______ proportional to the product
Definition
 Directly
Term
 Electrostatic force is ________proportional to the square distance
Definition
 Inversely
Term
 Two negatively charged objects will have an electrostatic force of
Definition
 repulsion
Term
 Electrons will flow in a circuit that is
Definition
 Closed
Term
 The term for matter that allows electrons to easily flow with very little resistance
Definition
 conductor
Term
 V = IR
Definition
 Ohm's law
Term
 term for the unit used to measure electric power
Definition
 Watt
Term
 Magnetic flux lines outside a magnet have a direction of
Definition
 North to South
Term
 The ends of a magnet are referred to as
Definition
 North and South poles
Term
 Magnetic like poles _______, magnetic opposite poles _______
Definition
 Repel, Attract
Term
 What are the three types of magnets
Definition
 natural, permanent, temporary
Term
 The type of magnet that earth and lodestones (magnetite) are
Definition
 Natural
Term
 Temporary magnets produced with an iron core wrapped with wire carrying electric current
Definition
 Electromagnets
Term
 Lines of magnetic flux traveling in the same direction will attract each other. true or false
Definition
 FALSE
Term
 Tapping an iron bar against a solid object in a magnetic field will help magnetize that material. true or false
Definition
 True
Term
 Magnetic poles can exist separately from each other and may have only one pole. true or false
Definition
 False
Term
 According to the laws of magnetism, how many poles will an atomic magnet have?
Definition
 two poles at this level
Term
 Magnetic flux lines Inside a magnet have a direction of
Definition
 South to North
Term
 In the US how often does AC current go through a complete cycle?
Definition
 1/60th of a sec+ 1 full cycle
Term
 What waveform represents AC current?
Definition
 Sine wave
Term
 What are examples of insulator?
Definition
 Rubber, Ceramic, Plastic
Term
 1 Volt=
Definition
 1 Joule/Coulomb
Term
 What does a circuit breaker do?
Definition
 Protects equipment from damage
Term
 Magnetic lines that surround a magnet are called:
Definition
 Flux Lines
Term
 Electromagnetic force is the same as:
Definition
 Potential difference
Term
 What are the 3 magnetic laws?
Definition
 Repulsion, Inverse square law, Magnetic poles
Term
 If you have high permeability you have____ retentivity
Definition
 Low
Term
 What are 3 properties of electrodynamics?
Definition
 Potential difference, Current, Resistance
Term
 When distance increases, force of attraction will_____?
Definition
 Decreases
Term
 What factors effect resistance of a conductor?
Definition
 Diameter-Bigger, less resistanceLength- Longer, More resistanceTemperature.
Term
 Conductor- increase temp, ______ flow
Definition
 Decrease
Term
 Semiconductor- increase temp, ______ flow?
Definition
 Increase
Term
 Insulator- Increase temp,______ flow?
Definition
 Increase
Term
 1 electron in the outer shell is the best conductor? True/False
Definition
 True
Term
 Inhibits flow, No free movement of electrons, Charge remains localized
Definition
 Insulator
Term
 Charges reside on outer surface, allows electrons to move freely/easily, usually made of metal
Definition
 Conuctors
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