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Magnetism
Electromagnetism
| Question | Answer |
|---|---|
| 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
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