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Magnetism

Electromagnetism

QuestionAnswer
What is the largest magnet? Earth
Define magnetism. material that attracts or repels other materials
Force push or pull on an object
_____ is the SI unit of magnetic strength. Tesla
What is magnetic permeability? ability of a material to attract a magnetic field and become magnetized or east of magnetism.
How well a material maintains itsmagnetism. Magnetic retentivity
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)
What are the 4 magnetic classifications of a material? nonmagnetic; ferromagnetic, paramagnetc, diamagnetic
Define nonmagnetic. material that is not affected by a magnetic field
Define Ferromanetic. material stongly attracted by magnetic field (ex. iron, cobalt, nickel)
Define Paramagnetic. material slightly attracted by a magnet
Define Diamagnetic. material weakly repelled by a magnet
What is a solenoid? coil of wire carrying a current
What is an electromagnet? coil of wire carrying a current with an iron core in coil
What is a helix? coil of wire
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
Self-induction coil of wire with constant potential difference (voltage)= unimpeded current flow; uses single coil - autotransformer
A _______ increases or decreases voltage. transformer
A autotransformer is used as the _______. kVp selector
Ohm is the unit of measure of _______. resistance
An autotransformer works off of mutual electromagnetic induction. T or F false - self
The _______ sits on the primary side of the high voltage circuit. autotransformer
Anything the RT touches on the control panel is on the _____ side of the high-tension tranformer. primary
The step down transformer is used for the ____. filament circuit (door bell)
The volt or kilovolt meter is always connected in _____. parallel
The ______ is conneced in series. ammeter
Converts electrical energy to mechanical energy. motors (ex. rotor)
Which device converts mechanical energy to electrical energy? a) motor b) dynamo c) generator b and c
Power loss is due to ____.1. varying magnetic field2. heat resistance3. AC current 2
A varying magnetic field leads to ____. hysteresis loss
Eddy current loss is due ___.1. varying magnetic field2. heat resistance3. AC current 3
What reduces kV-voltage (6-10v) and increases mA-amps (3-5 amps)? step down transformer
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
What is the equation for total power? P= IV
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
Like poles _____; unlike poles _____ repel, attract
Dipole every magnet has a north and south pole
Generator (dynamo) converts mechanical energy to electrical energy
Give examples of types of transformers. air core, open core, closed core, shell type
What are the two types of transformers? step up (high tension) or step down transformers
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)
Step Up Transformers increase line ______ to kv and decrease _________. voltage to kV, amperage to mA
Step Down Transformers dereases kV back to _____ to ______ and increase mA to _______. 6-10v, heat filament,3-5 amps
Which has more turns in the 2nd coil?step up or step down transformer step up transformer
Created by: sr4095