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Ch 4 RAD 150
Electricity, Magnetism, Electromagnetism
| Question | Answer |
|---|---|
| Primary function of an x-ray imaging system is to convert eletrical energy into _______energy. | electromagnetic |
| Unlike charges ____ and like charges ____. | attract; repel |
| Coulomb's Law states that electrostatic force is ___ proportional to the product of the electrostatic charges and ____ proportional to the square of the distance between them. | directly; inversely |
| Electric charge distribution is ____ throughout or on the surface. | uniform |
| Electric charge of a conductor is concentrated along the _____ curvature of the surface. | sharpest |
| _____ is the movement of electrons. (electrons moving from one cloud to another) | Induction |
| Electrification can be created by ___, ___, or ____. | contact; friction; induction |
| The smallest unit of electric charge is the _______. | electron |
| 1 coulomb is equal to | 6x10 to the (18th) electron charges |
| Rubbing a balloon on a wool sweater is an example of _____. | friction |
| ____ occurs when two objects touch and electrons are transfered between objects. | Contact |
| The unit of electric potential is the ____. | volt (V) |
| __________ is the study of electric charges in motion. | Electrodynamics |
| A ____ is any substance through which electrons flow easily. | conductor |
| ____, ____ and ____ are three types of insulators. | Glass, clay/earthlike materials, rubber |
| A _______ is a material that under some conditions behaves as an insulator and in other conditions behaves as a conductor. | semiconductor |
| The ____ is proportional to the number of electrons flowing in the electric circuit. | ampere |
| Increasing electric reistance results in a _____electric current. | reduced |
| What is Ohm's Law? | V=IR (volts=electric current x electric resistance) |
| Resistance (R) is measured in ____. | ohms |
| Electric current is measured in ____. | amperes (A) |
| _______ is a sine (sinusoidal) curve. | Waveform |
| _____ is identified as a 60 hZ current (___ - HZ in the rest of the world). | AC; 50 |
| In a ____ ______, electrons can be made to flow in one direction along the conduction. | direct current (DC) |
| In a ___ _____, electrons oscillate back and forth. | alternating current (AC) |
| A ____ circuit contains elements that are connected at their end rather than lying in a line along a conductor. | parallel |
| Electric power is measured in ____. | watts (W) |
| In an electric circuit, a ____ will inhibit the flow of electrons. | resistor |
| The current through out an entire circuit is ______. | constant |
| What is the electric power formula? | P=IV P= power in watts I=current in amps V= electrical potential in volts |
| Electrical power is measured in _____. | Watts (W) |
| Any charged particle in motion creates a _____ ____. | magnetic field |
| _______ objects can be made into magnets by induction. | Ferromagnetic |
| An accumulation of atomic magnets with their dipole aligned creates a ____ domain. | magnetic |
| The magnetic field is _______ by electron pairs. | neutralized |
| The iron core greatly increases the ______ of the magnetic field. | intensity |
| What are examples of nonmagnetic states of matter? | wood, glass |
| What are examples of diamagnetic states of matter? | water and plastic |
| What is an example of a paramagnetic state of matter? | gadolinium |
| What are examples of ferromagnetic state of matter? | iron, nickel or cobalt |
| ______ has low magnetic susceptibility; ____ has high magnetic susceptibility. | Wood; iron |
| The SI unit of magnet field strength is the ____. | tesla |
| One tesla (T) = ______ gauss (G). | 10,000 |
| Like magnetic poles ____ and unlike poles ____. | repel; attract |
| The magnetic force is ______ to the product of the magnetic pole strengths divided by the square of the distance between them. | proportional |
| A coil of wire is called a ____. | solenoid |
| If an electric potential is applied to objects such as copper wire, this would be termed ____ ____. | electric current |
| The insulator confines the electron flow to the _____. | conductor |
| An object is said to be _______ if it has too few or too many electrons. | electrified |
| Theoreticaly, electrons move from _____to _____. | negative; positive |
| Resistance is dependent on 4 things: | material, length, diameter and temperature |
| The unit for resistance is ____. | ohms |
| Theoreticaly, electrons move from _____to _____. | negative; positive |
| Resistance is dependent on 4 things: | material, length, diameter and temperature |
| Examples of insulators are ____ and ____. | rubber; glass |
| The unit for resistance is ____. | ohms |
| An example of direct current is a _____. | battery |
| The formula for ohms law is: | V=IR |
| Examples of insulator are ____ and ____. | rubber; glass |
| Examples of a semiconductor are ___ and ____. | silicon; germanium |
| Examples of conductors are ___ and ____. | copper; aluminum |
| Examples of superconductors are ___ and ___. | niobium; titanium |
| A _____ circuit contains elements that are connected at their end rather than lying in a line along a conductor. | parallel |
| The increased heat of a wire will _____ conduction. | decrease |
| _____ is the best material to conduct electricity. | Copper |
| The increased length of a wire will ____ conduction. | decrease |
| An increase in diameter will ____ conduction. | decrease |
| The unit for electron potential is ______. | volts |
| _____ is a material that under some conditins behaves as an insulator and in other conditions behaves as a conductor. | semiconductor |
| An example of AC is a _____. | generator |
| Two types of magnetic fields: | bipolar and dipolar |
| A _____ changes the intensity of alternating voltage and current. | transformer |
| _______ turn mechanical energy into electrical energy. | Generators |
| What is the Transformer Law? | Vs/Vp=Ns/Np |
| What is the Transformer Law Effect on Current? | Is/Ip=Np/Ns |
| Step up generator increases voltage and _______ amperage. | decrease |
| Step down generator will decrease voltage and _______ amperage. | increase |
| What is the formula for turns ratio? | Turns Ratio = Ns/Np |
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