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The smallest unit of electrical charge is the
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Electrification occurs through the movement of
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Bushong Ch 4

Electricity, Magnetism, Electromagnetism

QuestionAnswer
The smallest unit of electrical charge is the electron
Electrification occurs through the movement of electrons only
Like charges ___________ and unlike charges ____________. repel, attract
Electrostatic force is ___________ proportional to the distance between charges, and __________ proportional to the product of the charges inversely, directly
An electric potential applied to a conductor produces a magnetic field. T or F true
An electric potential applied to a conductor produces an electric current. T or F true
The charges on an electrified object are distributed evenly throughout the object
True or False: The charges of an electrified object are concentrated only beneath the surface of the object. false
What is a source of direct current battery
A generator is a source of direct current. T or F false
Alternating current is produced by a generator
Ohms law V= IR
Watts, kilowatts, megawatts, amperes all measure what power
Rubber and glass are examples of insulators
The rotation of electrons on their axis is the properly called electron spin
When a group of dipoles align, they create a magnetic domain
What is used to quantify magnetic field strength Telsa or Gauss
The force between magnetic poles is proportional to the ____ of the magnetic pole strengths, divided by the _________ of the distance between them. product, square
Iron, nickel, & cobalt are all considered _____________ materials and they are made up of small groups of atoms called ______________. ferromagnetic, magnetic domains
What is the power rating of a lamp that carries 2A at 120 V 240W
According to electromagnetic induction principles, which of the following situations will serve to increase the amount of voltage produced? increasing the number loops (turns) in the wire
What type of motor drives the rotating anode in the x-ray tube? induction
What type of transformers has one winding, no closed core, and varies both voltage and current autotransformer
Who was responsible for the discovery and determination of electromagnetic induction Michael Faraday
True or False: Positive electric charges in a circuit flow from positive to negative false
What causes more resistance humidity or dry air humidity
True or false: An ammeter would be a device that measures current true
A transformer in which the current is decreased going from the primary side of the circuit to the secondary side would be an example of which of the following? step up transformer
An atom with more electrons than protons will have what charge negative
When an uncharged metallic object experiences a shift of electrons in the electric field of another, this is electrification by induction
T or F: The relationship of xray intensity to distance (inverse square law) is identical to Coulomb's law true
Electrostatic force is inversely related to distance Coulomb's law
How are insulators incorporated to the use of electricity they are used to contain the electric flow
What happens to the current as resistance increases decreases
What type of electric circuit connects all circuit elements along the same conductor series
Which term describes an electric current whose electrons flow in one direction along a conductor direct
What atomic characteristic of a magnetic material creates a dipole its electrons spin predominantly in one direction
An iron bar exposed to a strong magnetic field may become electromagnet
Gadolinium is useful in MRI because it has which magnetic property paramagnetic
According to the laws of magnetism, how many poles will an atomic magnet have 2
What type of electrification occurs when you walk across a carpet friction
What type of electrification occurs when you touch a metal doorknob and you receive a shock contact
T or F: Electrostatic charge distribution is uniform throughout or on a surface true
T or F: Electric charge of a conductor is concentrated along the sharpest curvature of the surface true
the unit of electric potential volt
Materials strongly attracted to magnets are termed ferromagnetic
the unit of resistance Ohm
weakly repelled from both poles of a magnetic field diamagnetic (water)
weakly attracted to both poles of a magnetic field paramagnetic
Which scientist conducted experiments demonstrating that a magnetic field created by a flow of electric current was greater than the Earth's magnetic field (electromagnetism) Oersted
Which conductor angle, in relation to a magnetic field will produce the greatest voltage 90 degree angle to the field
What type of electromagnetic device uses the repulsion of like magnetic poles to create a rotation to convert electric energy to mechanical energy electric motor
Which principle in transformer operation determines whether the voltage will increase or decrease from the primary to secondary coils turns ratio
Which electromagnetic device is defined as operating on the principle of mutual induction to change the magnitude of current and voltage transformer
In a step-down transformer the current on the primary side is _________ than the secondary side smaller
The magnetic field lines of a solenoid move in what direction from south to north
What electrical device allows current to flow in one direction only rectifier
What is defined as the force needed to pass a current of 1 ampere thru a resistance of 1 ohm volt
A superconductor must be __________ in order to maintain its superconductivity cooled
A coiled, current carrying helix is termed solenoid
An electric motor converts electric energy to mechanical energy
An electric current is induced to flow in a circuit if some part of that circuit is in a changing magnetic field Faraday's law
The induced current flows in a direction such that it opposes the action that induces it Lenz's law
The fundamental unit of electric charge coulomb
The unit to measure electric current amperes
momentarily stores electric charge capacitor
imaginary field lines flux
a small magnet created by the electron orbit magnetic moment
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