Eletromagnetism
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| show | is a physical property that we cannot sense
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| show | is capable of creating a magnetic field
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| N pole point to S pole of other | show 🗑
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| a permanent magnet | show 🗑
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| show | alnico is used in
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| Iron | show 🗑
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| show | if 2 magnets are brought together, N to N poles will _____, whereas N to S poles will _____.
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| show | are affected by another magnetic field
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| most magnetic materials | show 🗑
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| a navigational compass | show 🗑
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| show | classification of magnetism
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| at the poles | show 🗑
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| show | have a similar formulation as Coulomb's law of electrostatics
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| show | depends on the permeability of matter separation the magnets
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| show | require that there be a S pole for ever N pole
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| both obey the inverse square law | show 🗑
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| show | is present in some naturally occuring ores
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| show | when a charged particle moves in a stright line, a magnetic field is
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| show | when iron is fabricated into a magnet, magnetic domains
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| attracted to the iron | show 🗑
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| principal classication of magnets | show 🗑
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| show | the physical laws of magnetism are similar to the laws of ___
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| show | cannot be felt or sensed
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| show | exists in atoms with odd numbers of electrons in any shell
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| show | when a large number of atomic magnets come together with their dipoles aligned
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| ferromagnetic material | show 🗑
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| show | are artificially produced by charging them in the field of an electromagnet
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| show | are unaffected by a magnetic field; examples - wood, glass, plastic
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| Alnico | show 🗑
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| Electromagnets | show 🗑
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| show | SI unit for magnetic flux (T)=
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| show | a magnetic field is induced perpendicular to the particle motion
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| show | has an associated magnetic field
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| electrons in motion | show 🗑
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| show | is expressed in units of volts
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| Oersted | show 🗑
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| a battery | show 🗑
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| show | the principal advantage of an electromagnet over a solenoid is magnetic field
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| faraday's law | show 🗑
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| electric current | show 🗑
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| magnetic field | show 🗑
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| a changing magnetic field is present | show 🗑
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| mutual 2 coils / self 1 coil | show 🗑
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| changes direction | show 🗑
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| show | if 2 coils are positioned near each other and a varying source of EMF is passed through the 1st coil
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| show | conduct DC relatively unimpeded
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| in the secondary coil | show 🗑
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| Generator | show 🗑
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| show | in a transformer is based on mutual induction
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| source of EMF | show 🗑
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| the commutator ring | show 🗑
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| show | the electric current produced by an AC generator has:
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| pulsating & in 1 direction | show 🗑
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| show | one difference b/t an electric generator & an electric motor is the
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| Switch | show 🗑
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| rotate the anode | show 🗑
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| show | the magnitude of induced current in Faraday's experiment depends on 4 factors
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| mutual & self induction | show 🗑
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| mutual induction | show 🗑
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| show | induction of an opposing EMF in a coil by its own varying magnetic field from AC
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| secondary voltage | show 🗑
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| show | 3 principle casues for transformer energy losses
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| show | aka copper loss; caused by inherent resistance to current flow that is found in all conduction; proportional to square of current; minimized by using low-resistnace
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| hysteresis loss | show 🗑
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| show | currents opposing the cause which produced them; laminating the transformer core reduces this loss
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| diff b/t AC & DC | show 🗑
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| show | transformers have iron cores in order to intensify the
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| the transformer | show 🗑
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| Voltage | show 🗑
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| step-up transformer | show 🗑
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| closed-core | show 🗑
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| turns ratio is | show 🗑
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| show | contains a single winding to serve as both primary & secondary coils
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| magnetic field produced | show 🗑
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| show |
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| converts AC to DC | show 🗑
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| thermionic emission refers to | show 🗑
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| show |
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| is a component of a tube-type of rectifier | show 🗑
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| show | from cathode to anode only when the anode is connected to a positive voltage with respect tot eh cathode
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| show | electrons will be permitted to flow in one direction but not the other
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| show | is one of the fundamental forces. When a charged particle is in motion a magnetic force field perpendicular to the motion will be created.
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| show | is a temporary magnet produced by a moving electric current
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| show |
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| electron flow is actually from negative to positive poles while conventional electric current is described as going from positive to negative poles. | show 🗑
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| show | movement of conductor
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| index finger | show 🗑
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| middle/other finger | show 🗑
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| show | 1- move the conductor through a stationary, unchanging-strength magnetic field; 2- move magnetic lines of force through a stationary conduction with an unchanging-strenght magnetic fiels; 3- vary the magnetic flux strength from a stationary magnet through
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| show | 1- the strength of the magnetic field; 2- the speed of the motion b/t lines of force & conductor; 3- the angle b/t the magnetic lines of force & the conductor; 4- the number of turns in the conduction coil
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| show | generator converts mechanical energy to electrical energy & a motor converts electrical energy to mechanical energy. (if the power goes out we can use a generator (mechanical) to have lights (electricity); motor battery (electrical) to start motor (mechan
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| function of a transformer | show 🗑
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| transformer law | show 🗑
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| show | used to vary the incoming line voltage to an appropriate level for the high voltage step-up transformer.
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| show | creates an electrical "one way street" by permitting electrons to flow easily in 1 direction while offering a high resistance to movement in the other direction.
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| show | the process by which alternating current is changed to pulsating direct current
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| componets for full-wave rectified circuit | show 🗑
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| show |
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| show |
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| which of the following is not required for an electric generator? | show 🗑
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| the commutator ring | show 🗑
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| the main difference b/t AC and a DC electric generator is | show 🗑
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| alternating pos (+) & neg (-) intensity | show 🗑
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| the electric current produced by an AC generator has: | show 🗑
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| show |
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| show |
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| source of EMF | show 🗑
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| show |
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| Switch | show 🗑
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| in electric generators & motors the commuator ring acts as a | show 🗑
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| show |
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| strength, velocity, angle, # of turns | show 🗑
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| the magnitude of induced current in Faraday's experiment depends on 4 factors | show 🗑
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| show |
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| name the 2 laws of electromagnetics (Faraday's Laws) | show 🗑
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| mutual induction | show 🗑
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| 2 coils placed close together & the 1st coil is supplied with a varying or AC current causes a flow in the 2nd coil. Primary coil - 1st coil; seconday coil - is the coil induced from the 1st coil alternating current (AC) | show 🗑
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| self induction | show 🗑
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| show |
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| show |
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| in the relationship b/t primary & seconday voltage in a step-up transformer which is greater? | show 🗑
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| show |
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| show |
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| I2R loss | show 🗑
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| aka copper loss; caused by inherent resistance to current flow that is found in all conduction; proportional to square of current; minimized by using low-resistnace | show 🗑
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| show |
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| show |
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| show |
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| currents opposing the cause which produced them; laminating the transformer core reduces this loss | show 🗑
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| diff b/t AC & DC | show 🗑
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| can be seen by converting the AC (alternating current) to DC (direct current) by replacing the slip rings on an Ac current with a simple device called the communtator ring, which acts like a switch, thus changing the polarity of the contact on the brush w | show 🗑
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| show |
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| show |
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| changes electrical potential & current into higher or lower intensities | show 🗑
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| Voltage | show 🗑
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| show |
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| a trnsformer with a tuns ratio greater than I is: | show 🗑
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| closed-core | show 🗑
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| show |
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| turns ratio is | show 🗑
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| show |
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| show |
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| contains a single winding to serve as both primary & secondary coils | show 🗑
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| magnetic field produced | show 🗑
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| show |
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| rectifier | show 🗑
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| show |
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| electron emission from a heated source | show 🗑
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| show |
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| show |
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| tube rectifier/vacuum-tube diode, electron flow is | show 🗑
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| from cathode to anode only when the anode is connected to a positive voltage with respect tot eh cathode | show 🗑
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| circuit containing a solid-state diode | show 🗑
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| show |
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| show |
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| is one of the fundamental forces. When a charged particle is in motion a magnetic force field perpendicular to the motion will be created. | show 🗑
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| Electromagnets | show 🗑
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| show |
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| show |
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| electron flow is actually from negative to positive poles while conventional electric current is described as going from positive to negative poles. | show 🗑
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| thumb pointing | show 🗑
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| show |
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| show |
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| magnetic lines of force field | show 🗑
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| middle/other finger | show 🗑
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| show |
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| show |
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| 1- move the conductor through a stationary, unchanging-strength magnetic field; 2- move magnetic lines of force through a stationary conduction with an unchanging-strenght magnetic fiels; 3- vary the magnetic flux strength from a stationary magnet through | show 🗑
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| 4 factor controlling strength of electromagnetically induced current | show 🗑
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| 1- the strength of the magnetic field; 2- the speed of the motion b/t lines of force & conductor; 3- the angle b/t the magnetic lines of force & the conductor; 4- the number of turns in the conduction coil | show 🗑
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| diff generator & motor | show 🗑
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| componets for full-wave rectified circuit | show 🗑
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