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44 Cards in this Set
- Front
- Back
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the smallest unit of electrical charge is the ______.
a. electron b. proton c. neutron d. neutrino |
a. electron
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Electrification occurs through the movement of _____.
a. protons only b. protons and electrons c. electrons only d. electrons and neutrons |
c. electrons only
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Like charges _____ and unlike charges _____.
a. repel, repel b. attract, attract c. attract, repel d. repel, attract |
d. repel, attract
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Electrostatic force is _____ proportional to the distance between charges, and _____ proportional to the product of the charges.
a. directly, inversely b. inversely, directly c. inversely, inversely d. directly, directly |
b. inversely, directly
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The charges on an electrified object are distributed _____.
a. in the center of the object b. on the side nearest the charge c. on the topside of the object d. evenly throughout the object |
d. evenly throughout the object
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On the surface of an electrified object, the charges concentrate _____.
a. on the top side b. on the underside c. on the sharpest curvatures d. on the smoothest curvatures |
c. on the sharpest curvatures
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A _____ is a source of direct current.
a. wall socket b. battery c. generator d. spark |
b. battery
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What is the unit of electric potential?
a. watt b. amp c. volt d. ohm |
c. volt
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An electric potential applied to a conductor produces a(n) _____.
a. electric current. b. magnetic field. c. electric insulator. d. both A and B |
d. both A and B
Electric Current and Magnetic Field |
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An alternating (AC) current is represented by a _____ line.
a. sinusoidal b. horizontal c. vertical d. descending |
a. sinusoidal
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A _____ uses direct current.
a. hair dryer b. toaster c. microwave d. flashlight |
d. flashlight
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Alternating current is produced by a _____.
a. battery b. generator c. capacitor d. semiconductor |
b. generator
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What is Ohm’s Law?
a. I = V/R b. V = I/R c. R = VI d. I = VR |
a. I = V/R
also expressed V = IR OR R = V/I |
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A charged particle in motion creates a(n) _____.
a. negative charge b. positive charge c. magnetic field d. electrostatic charge |
c. magnetic field
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Electrical power is measured in _____.
a. coulombs b. amperes c. volts d. watts |
d. watts
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Rubber and glass are _____.
a. semiconductors b. conductors c. insulators d. superconductors |
c. insulators
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The rotation of electrons on their axis is the property called _____.
a. magnetic force b. electron spin c. unified field theory d. magnetic induction |
b. electron spin
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When a group of dipoles are aligned, they create a _____.
a. magnetic domain b. paramagnetic material c. magnetic resonance d. a north pole |
a. magnetic domain
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In the United States alternating current goes through a complete cycle every _____ second.
a. 1/120 b. 1/100 c. 1/60 d. 1/30 |
c. 1/60
one complete cycle per minute |
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What is the SI unit of magnetic field strength?
a. ampere b. tesla c. dipole d. ohm |
b. tesla
The SI unit of magnetic field strength is the tesla or gauss. |
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The force between magnetic poles is proportional to the _____ of the magnetic pole strengths, divided by the _____ of the distance between them.
a. square, sum b. sum, square c. square, product d. product, square |
d. product, square
The force between magnetic poles is proportional to the product of the magnetic pole strengths, divided by the square of the distance between them. |
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What type of material can be made magnetic when placed in an external magnetic field?
a. diamagnetic b. ferromagnetic c. paramagnetic d. nonmagnetic |
b. ferromagnetic
Ferromagnetic material can be made magnetic when placed in an external magnetic field. |
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Like magnetic poles _____ and unlike magnetic poles _____.
a. attract, attract b. repel, repel c. repel, attract d. attract, repel |
c. repel, attract
Like magnetic poles repel and unlike magnetic poles attract. |
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Water is a _____ material.
a. paramagnetic b. magnetic c. diamagnetic d. ferromagnetic |
c. diamagnetic
Water is a diamagnetic material. |
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The magnetic intensity of an electromagnet is greatly increased by the addition of a(n) _____ core.
a. wood b. iron c. aluminum d. copper |
b. iron
The magnetic intensity of an electromagnet is greatly increased by the addition of an iron core. |
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Platinum is magnetically classified as which of the following ?
a. nonmagnetic b. diagmagnetic c. paramagnetic d. ferromagnetic |
c. paramagnetic
between Diamagnetic and Ferromagnetic |
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Which scientist used a compass and a wire carrying electric current to demonstrate and study electromagnetism?
a. Oersted b. Lenz c. Ohm d. Faraday (not the one from "LOST" TV show) |
a. Oersted
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Which scientist formulated a law that explains a principle of electromagnetic induction?
a. Oersted b. Lenz c. Ohm d. Faraday (not the one from "LOST" TV show) |
d. Faraday (not the one from "LOST" TV show)
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A ____ contains elements that are connected at their ends rather than lying in a line along a conductor.
a. series circuit b. parallel circuit c. alternating current d. direct current |
b. parallel circuit
A parallel circuit contains elements that are connected at their ends rather than lying in a line along a conductor. |
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In a ____ , all circuit elements are connected in a line along the same conductor.
a. series circuit b. parallel circuit c. alternating current d. direct current |
a. series circuit
In a series circuit, all circuit elements are connected in a line along the same conductor. |
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A ____ is a material that under some conditions behaves as an insulator and in other conditions behaves as a conductor.
a. insulator b. conductor c. semiconductor d. superconductor |
c. semiconductor
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The study of electric charges in motion is ___
a. thermodynamics b. electrodynamics c. ferrodynamics d. electrostatics |
b. electrodynamics
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Titanium is an example of a(n) ____ , having no resistance to electron flow and no electric potential required.
a. superconductor b. conductor c. semiconductor d. insulator |
a. superconductor
it also must be VERY COLD |
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Silicon or Germanium are examples of ______ . It can be conductive or resistive and are used in computers.
a. superconductor b. conductor c. semiconductor d. insulator |
c. semiconductor
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The study of stationary electric charges is_____.
a. thermodynamics b. electrodynamics c. ferrodynamics d. electrostatics |
d. electrostatics
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Lightning most frequently occurs _____.
a. between cloud and cloud b. between cloud and Earth |
b. between cloud and Earth
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The fundamental unit of electric charge is the ____.
a. watt b. joule c. coulomb d. volt |
c. coulomb
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the higher the voltage, the higher ______.
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the potential to do work
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The voltage across the total circuit or any portion of the circuit is equal to the current times the resistance.
V=IR is: a. Farraday's Law b. Ohm's Law c. Oersted's Law d. Murphy's Law |
b. Ohm's Law
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The part of the rotating anode that is made up of several fixed electromagnets is called ____.
a. stator b. rotor c. motor d. filament |
a. stator
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This type of transformer confines even more of the magnetic field lines of the primary winding because the secondary is wrapped around it and there are essentially two cores.
a. closed core b. autotransformer c. shell-type |
c. shell-type
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this transformer is generally smaller because the primary and secondary sides are connected to the same wire.
a. closed core transformer b. austotransformer c. shell type transformer |
b. austotransformer
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Varying ___ _____ ____ induces an electric current.
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magnetic field intensity
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A coil of wire is called a(n) ____ in an electromagnet.
a. adenoid b. solenoid c. filament d. commutator ring |
b. solenoid
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