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The study of stationary electric charges is
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The study of electric charges in motion
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| Question | Answer |
|---|---|
| The study of stationary electric charges is | electrostatics |
| The study of electric charges in motion | electrodynamics |
| Electricity is typically thought to be the same as | electrodynamics |
| The unit of measurement of electrical charges (SI) is | Coulomb |
| A material that has a large number of free electrons is a | good conductor |
| One of the laws of electrostatics is that like charges ________ and unlike charges ___________. | repel; attract |
| As two charges get closer, the electrostatic force is | inversely proportional to the square of distance b/t them |
| If a conductor is curved, the greatest amount of charge will be found | at the area of the greatest curvature of the conductor |
| Rubbing a rubber rod with fur is an example of electrification by | friction |
| Electrification by induction requires that the two objects | are not at all in contact with each other |
| To get electrons to flow along a conductor, there must be | excessive positive and negative charges at opposite ends |
| The ability to do work because of a separation of charges is | electric potential |
| The flow of electrons along a conductor is | electric current |
| The property of a circuit that impedes the flow of electrons is | resistance |
| The volt is the unit of measure for | electric potential |
| The ampere is the unit of measure for | electric current |
| A volt is the ratio of work per unit of charge and is written | Joules/Coulomb |
| Kilovoltage peak is abbreviated as | kVp |
| A material that allows electrons to move is a(n) | conductor |
| A material that resists the movement of electrons is a(n) | insulator |
| Which of the following materials is a good conductor? | copper |
| Glass is an example of a(n) | insulator |
| A battery produces | direct current |
| Current that changes direction in the conductor is | alternating current |
| The 60 Hz of electricity flowing into homes in the U.S. characterizes | alternating current |
| Ohm's law can be written as | volts = amps × ohms |
| Ohm’s law can be written as | I = V/R |
| When a conductor is longer: | resistance increases |
| When a conductor has a smaller cross-sectional area: | resistance increases |
| When a metallic conductor is colder: | resistance decreases |
| When a conductor is more twisted: | resistance remains the same |
| Which of the following is NOT a good electrical conductor? | Glass |
| Which of the following is NOT a good insulator? | Gold |
| Rubber is | an excellent insulator |
| A closed pathway of wires and related elements is a(n) | electric circuit |
| When a switch is turned on, the electric circuit | is closed |
| A device that temporarily stores charge is the | Parallel circuit |
| A device that temporarily stores charge is the | capacitor |
| An adjustable form of a resistor is the | rheostat |
| Which of the following opens a circuit to keep the circuit and devices safe? | Fuse and circuit breaker |
| Which of the following devices allow the electricity to flow in one direction only? | Diode |
| The device that regulates the amount of current flowing in the circuit is the | resistor |
| The device that produces electrons through a chemical reaction is a | battery |
| Which of the following devices can increase or decrease voltage by a set amount? | Battery and transformer |
| The purpose of grounding is to | none of the above |
| Material that conduct electricity, not not conductors & insulate but not as well as insulator | semiconductor |
| A circuit w/ elements that are arranged like a “bridge” or branching across a conductor is | parallel circuit |
| The ability of a material to attract iron, cobalt, or nickel is called | magnetism |
| The lines of force in space associated with a magnet are called | Lines of flux |
| Inside the magnet, the lines of flux travel from | south pole to north pole |
| Outside the magnet, the lines of flux travel from | north pole to south pole |
| Like poles of a magnet _________ each other and opposite poles ________ each other. | repel; attract |
| The force of magnetic attraction varies | inversely with the square of the distance between the poles |
| Magnetic field strength is measured in | tesla |
| A material that is weakly repelled by a magnetic field is classified as | diamagnetic |
| A material that is strongly attracted to a magnetic field is | ferromagnetic |
| A material that is weakly attracted to a magnetic field is | paramagnetic |
| Wood and plastic are considered | nonmagnetic |
| Faraday’s Law of Electromagnet Induction, if the strength of the magnetic field is ^, _____ ^ | current |
| Reducing the number of coils in the wire will result in | reduced electromagnetic induction |
| Increasing the strength of the magnetic field results in | increased electromagnetic induction |
| Slowing down the speed at which the conductor passes through the magnetic field results in | reduced electromagnetic induction |
| Mutual induction involves electricity being induced into a | secondary coil |
| With mutual induction, to induce voltage in the secondary coil, there must be | alternating current in the primary coil of wire |
| ______________ current is induced in the secondary coil when mutual induction takes place. | alternating |
| A device that converts mechanical energy to electrical energy is a | generator |
| A device that converts electrical energy to mechanical energy is a | motor |
| A step-up transformer results in | increased voltage |
| A step-down transformer results in | increased current |
| A step-up transformer results in | decreased current |
| A step-down transformer results in | decreased voltage |
| A transformer with 100 times more turns on the secondary side as compared with the primary | is a step-up transformer |
| A transformer with 100 turns on the primary side and 50 turns on the secondary | is a step-down transformer |
| The autotransformer | uses self-induction |
| The autotransformer is found on the | primary circuit |
| The mA meter is found on the | secondary circuit |
| The rectifiers are found on the | secondary circuit |
| The main power switch is found on the | primary circuit |
| The x-ray tube (not filaments) is found on the | secondary circuit |
| The rheostat is found on the | filament circuit |
| The primary side of the high-voltage transformer is found on the | primary circuit |
| The timer circuit is found on the | primary circuit |
| The step-down transformer is found on the | filament circuit |
| The secondary side of the high-voltage transformer is found on the | secondary circuit |
| The filaments within the x-ray tube are found on the | filament circuit |
| The device referred to as the kVp selector is the | autotransformer |
| The only adjustable transformer in the x-ray circuit is the | autotransformer |
| The timer located on the secondary circuit is the | mAs timer |
| AEC stands for | automatic exposure control |
| For AEC, the ionization chamber is placed between the ____________ and _____________. | patient; image receptor |
| Assuming all other factors are accurately adjusted, the exposure time with AEC is based on | the anatomy placed over the ionization chamber |
| The _____________________ converts volts to kilovolts. | step-up transformer |
| AEC controls the ________________ of radiation reaching the image receptor | quantity |
| The devices that change alternating to direct current are the | rectifiers |
| The solid-state rectifier has a(n) _______ crystal and a(n) _________ crystal. | p-type; n-type |
| The n-type crystal from a solid-state rectifier has an abundance of | electrons |
| Half-wave rectification | all of these answers |
| Ripple refers to | the fluctuation in voltage in the electricity |
| Single-phase full-wave rectified current has | 100% ripple |
| The less the ripple the | more consistent the energy of the x-rays produced |
| The least amount of ripple is the result of | high-frequency generators |
| What must be adjusted to change the temperature of the filament? | Rheostat |
| The rate of flow of electrons passing through the x-ray tube during an exposure is | mA & tube current |
| Adjusting the rheostat changes the _______________ in the ______________ circuit. | resistance; filament |
| The purpose of the filament circuit is to | boil electrons off the filament |
| A general purpose radiographic tube typically has ____ filament(s). | 2 |
| At the operating console, you choose the filaments being used by selecting what | small or large focal spot |
| Electric charges are found only on the outside of a conductor. | True |
| Only electrons are free to move in solid conductors. | True |
| Water is a good conductor | True |
| Lines of flux in the same direction attract each other. | False |
| Lines of flux in the opposite directions attract each other. | True |
Created by:
Madisonanne28
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