Electromagnetism
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| What is the largest magnet? | Earth
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| Define magnetism. | material that attracts or repels other materials
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| Force | push or pull on an object
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| _____ is the SI unit of magnetic strength. | Tesla
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| What is magnetic permeability? | ability of a material to attract a magnetic field and become magnetized or east of magnetism.
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| How well a material maintains itsmagnetism. | Magnetic retentivity
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| What are the 3 classifications of magnets and give one example of each? | natural (earth), artificial (iron -man made), Electromagnet (locks on xray tube or fire doors)
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| What are the 4 magnetic classifications of a material? | nonmagnetic; ferromagnetic, paramagnetc, diamagnetic
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| Define nonmagnetic. | material that is not affected by a magnetic field
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| Define Ferromanetic. | material stongly attracted by magnetic field (ex. iron, cobalt, nickel)
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| Define Paramagnetic. | material slightly attracted by a magnet
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| Define Diamagnetic. | material weakly repelled by a magnet
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| What is a solenoid? | coil of wire carrying a current
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| What is an electromagnet? | coil of wire carrying a current with an iron core in coil
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| What is a helix? | coil of wire
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| Contains a primary coil of wire creating a magnetic field and flow of current with a secondary coil introduced with its own current creating another magneric field. | mutual induction
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| Self-induction | coil of wire with constant potential difference (voltage)= unimpeded current flow; uses single coil - autotransformer
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| A _______ increases or decreases voltage. | transformer
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| A autotransformer is used as the _______. | kVp selector
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| Ohm is the unit of measure of _______. | resistance
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| An autotransformer works off of mutual electromagnetic induction. T or F | false - self
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| The _______ sits on the primary side of the high voltage circuit. | autotransformer
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| Anything the RT touches on the control panel is on the _____ side of the high-tension tranformer. | primary
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| The step down transformer is used for the ____. | filament circuit (door bell)
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| The volt or kilovolt meter is always connected in _____. | parallel
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| The ______ is conneced in series. | ammeter
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| Converts electrical energy to mechanical energy. | motors (ex. rotor)
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| Which device converts mechanical energy to electrical energy? a) motor b) dynamo c) generator | b and c
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| Power loss is due to ____.1. varying magnetic field2. heat resistance3. AC current | 2
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| A varying magnetic field leads to ____. | hysteresis loss
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| Eddy current loss is due ___.1. varying magnetic field2. heat resistance3. AC current | 3
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| What reduces kV-voltage (6-10v) and increases mA-amps (3-5 amps)? | step down transformer
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| If you have a transformer with 500 turns in the primary and 250 turns in the secondary coil, a)what is the turns rtio b)Is it a step up or step down transformer? | a) 250/500= 0.5:1b) step-down transformer
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| What is the equation for total power? | P= IV
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| If you have a portable viewbox that runs off 220 v and 3 amp, what is the total power requirement? | P=IVP=220(3)P=660 watts
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| Like poles _____; unlike poles _____ | repel, attract
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| Dipole | every magnet has a north and south pole
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| Generator (dynamo) | converts mechanical energy to electrical energy
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| Give examples of types of transformers. | air core, open core, closed core, shell type
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| What are the two types of transformers? | step up (high tension) or step down transformers
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| What are the 3 main causes of power loss? | resistance (loss of power due to heat)hysteresis (loss of power due to changing magnetic field)Eddy current (due to AC)
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| Step Up Transformers increase line ______ to kv and decrease _________. | voltage to kV, amperage to mA
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| Step Down Transformers dereases kV back to _____ to ______ and increase mA to _______. | 6-10v, heat filament,3-5 amps
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| Which has more turns in the 2nd coil?step up or step down transformer | step up transformer
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