Term
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Definition
| naturally occuring magnetic rocks |
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Term
| when is a magnet polarized |
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Definition
| when it has a north and south pole |
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Term
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Definition
| materials that can be converted into a magnet |
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Term
| where do magnetic fields exist |
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Definition
| in areas with magnetic force |
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Term
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Definition
| the number of magnetic field lines passing through a surface |
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Term
| where is a magnetic field strongest |
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Definition
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Term
| where do magnetic field lines leave |
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Definition
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Term
| where do magnetic field lines enter |
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Definition
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Term
| current carrying wires produce a |
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Definition
| magnetic pole perpendicular to the direction of the current |
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Term
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Definition
| the direction of the current is the direction of the magnetic field |
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Term
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Definition
| a long coiled wire which increases total strength |
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Term
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Definition
| the alignment of electrons of multiple atoms in a group of atoms |
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Term
| when does a material become a magnet |
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Definition
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Term
| what does a motor convert |
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Definition
| electrical energy to kinetic energy |
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Term
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Definition
| a device used to measure small currents |
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Term
| a changing magnetic field can produce a |
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Definition
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Term
| electromagnetic induction |
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Definition
| the process of generating a current through a circuit |
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Term
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Definition
| the influence that makes the current flow from higher to lower potential difference |
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Term
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Definition
| consists of a number of wire loops around an iron core that rotates between a north and south pole of a magnet |
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Term
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Definition
| the wire coil of an electric motor |
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Term
| in the U.S. utilities use a frequency of |
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Definition
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Term
| In the U.S. we use a voltage of |
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Definition
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Term
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Definition
| the direction of current flow |
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Term
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Definition
| An induced current is always in such a direction as to oppose the motion or change causing it |
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Term
| Lenz's law causes the armature of a generator to be |
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Definition
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Term
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Definition
| uses lenz's law to stop oscillation |
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Term
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Definition
| generated in a metal and produces a magnetic field that acts to oppose the motion that caused the current |
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Term
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Definition
| the induction of emf in a wire carrying changing current |
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Term
| In the changing current due to self inductance a back-emf is created which makes the potential of the top of the wire |
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Definition
| more negative than the bottom of the wire |
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Term
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Definition
| devices that use self inductance to increase or decrease AC voltages |
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Term
| what did JJ Thompson discover? |
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Definition
| the charge to mass ratio of an electron |
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Term
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Definition
| differing forms of an atom which have different masses but the same chemical properties |
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Term
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Definition
| a device used to determine the charge of mass ratios of certain ions |
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Term
| a changing electric field produces a changing magnetic field |
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Definition
| electric charges aren't necessary |
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Term
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Definition
| a combined electric and magnetic field that travels through space at right angles to one another |
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Term
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Definition
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Term
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Definition
| the application of AC voltage onto a section of quartz crystal which results in sustained oscillations |
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Term
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Definition
| high frequency Em waves that are created when high energy electrons strike the metal target inside a cathode ray tube |
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Term
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Definition
| the direction of a magnetic force on a moving charge is always perpendicular to the magnetic field and the velocity of the charge |
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