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RT Concepts
Atom, Electromagnetism, Rectification
| Question | Answer |
|---|---|
| Isotope | Atoms that have same proton number but different neutron number. |
| Orbital shells range from K through ___. | Q |
| Principal quantum number is represented by the letter ___. | N |
| The binding energy of an electron is measured in _________. | electron volt (eV) |
| The periodic table lists ___ naturally occurring elements and an additional __ elements created in the laboratory. | 92, 18 |
| The number of electrons in the outermost shell of an atom determines the chemical combining characteristic or _________. | Valence |
| A form of energy that is the result of electric and magnetic disturbances in space is called _________. | Electromagnetic energy |
| Gamma rays originate from ____________________. | the nucleus of radioactive materials |
| One of the most common properties of all forms of electromagnetic radiation is __________. | Velocity |
| Electromagnetic radiation with energies of approximately 10 eV and higher are capable of _______________. | Ionizing an atom or molecule |
| The dual nature of electromagnetic radiation is called ___________. | Wave-particle duality of radiation |
| Electromagnetic waves travel in the form of ____ waves. | Sine |
| Wavelength is usually measured from __________ or _______________ | crest-to-crest, trough-to-trough |
| Wavelength is represented by the Greek letter ____. | Lambda |
| Diagnostic wavelengths are measured in _____. | Angstroms |
| The wavelength of diagnostic x-rays is _____. | 0.1 - 0.5 Angstroms |
| The intensity of wave defined by maximal height is called _________. | Amplitude |
| The number of waves that passes a particular point in a given time frame or number of cycles per second is called __________. | Frequency |
| The time required to complete one cycle of the wave is called ___________. | Period |
| Frequency and wavelength are _____________ proportional. | Inversely |
| Electromagnetic radiation acts like a small bundle of energy, called a _________ or _________. | Photon, Quantum |
| Photon energy and frequency are ____________ proportional. | Directly |
| The study of the distribution of fixed charges or electrons at rest is called __________. | Electrostatics |
| The process of electron charges being added or subtracted from an object is called _________. | Electrification |
| __________________ are materials that inhibit the flow of electrons. | Insulators |
| ______________ have the ability to conduct under certain conditions and insulate under others. | Semi-conductors |
| Electrons move from the _________ concentration to the __________ concentration. | Highest, lowest |
| Conventional electric current is described as going from __________ to ________ poles, while electron flow is actually from ____ to ____ poles. | Positive, negative, negative, positive |
| ________ refers to the quantity or number of electrons flowing. | Current |
| The unit of current is called _______. | Amp |
| X-ray equipment uses __________ units to regulate the number of electrons available to produce x-ray photons. | milliamperage |
| The force or strength of electron flow is called ___________. | Potential difference |
| The total maximum difference of potential between the positive and negative ends of the electron source is called _________. | Electromotive force |
| The unit of potential difference is called ____. | Volt |
| The unit of resistance is called the ______. | OHM |
| What is another name for variable resistor? | Rheostat |
| The force fields that are created when magnetic dipoles orient to create a magnet are called _____________. | Lines of force or magnetic field |
| Lines of force always flow ________ to ________ outside a magnet and ________ to _______ within a magnet. | North, South; South, North |
| Direct-current motors use _________ rings. | commutator |
| Alternating-current motors use __________ rings. | slip |
| __________ motors are used in rotating anode x-ray tubes. | Induction |
| Galvanometers use _________ current. | direct |
| Dynamometers use __________ current. | alternating |
| Whn a meter is connected in series, the current is measured with a(n) ___________. | ammeter |
| When a meter is connected in parallel, the potential difference is measured with a(n) ________. | voltmeter |
| When voltage is increased from primary to secondary, it is called a ___________ ______________. | step-up transformer |
| When voltage is decreased from primary to secondary, it is called a ______________________________________ | step-down transformer |
| All transformers must operate on __________ current. | alternating |
| ______ __________ (copper loss) is caused by inherent resistance to current flow that is found in all conductors. | I2R loss |
| __________ ____________ (lagging loss) occurs when energy is expended as continually changing AC current magnetizes. | Hysteresis loss |
| ________ __________ _____________ is a result of currents opposing | |
| The process by which alternating current is changed to pulsating direct current is called ______. | Rectification |
| A rectifying semiconductor created by sandwiching a p-type crystal with an n-type to form a p-n junction is called a _______. | Diode |
| __-type materials have loosely bound electrons that move freely between an atom's conduction bands. | N |
| __-type materials have electron traps made up of positively charged holes that tend to attract and hold electrons instead of permitting free movement to another atom. | P |
| In a diode, electrons flow from the ___ to the ___ side of the p-n junction. | N, P |
| Conventional electrical current moves from the ___ to the ___ side. | P, N |
| Electron flow will always be from ____ to ____, which means conventional electrical current will always be from ____ to ______. | Cathode, anode; anode, cathode |
| Self rectification was replaced by _________ rectification. | Half-wave |
| A device that converts mechanical energy to electrical energy by electromagnetic induction is called a(n) ___________. | Electric generator |
| There are _____ alternations per second with a 60-cycle current. | 120 |
| A device that converts electrical energy to mechanical energy is called a(n) _________. | Electric motor |
| An electromagnetic device that changes alternating current from low voltage to high voltage or vice versa is called a(n) ________. | Transformer |
| This electromagnetic device employs the principle of _______________________ induction. | electromagnetic mutual |
| An electromagnetic device operating on the principle of self-inductance is called a(n) ___________. | Choke coil |
| Rectification systems are connected between the secondary side of the _____________ and the _____________. | X-ray transformer, x-ray tube |
Created by:
rad1958tech