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Electrostatics

Electrodynamics (Electricity)

QuestionAnswer
Define Electrostatics. The study of electrons at rest
Define Electrodynamics. Electrons in motion (current flow)
Define electrification. Gain or loss of electrons from matter.
Three types of electrification. Friction, Contact, Induction.
Define friction and state whether or not it confers the same or opposite charge. rubbing, same charge
Define contact and state whether or not is confers the same or opposite charge. touch, same charge
Define induction and whether or not it confers the same or opposite charge. No contact between objects, opposite charge
What is a coulomb? unit of electric charge
1 coulomb is equal to ____ electric charges 1 C = 6.3 x 10^18 electric charges
What is the difference between electrification and ionization? Electrification is a gain/loss by matter whereas ionization is a gain/loss by an atom.
Finish this law Unlike charges__________, like charges _____________ attract, repel
Finish this law Electrostatic force is _____ _____ to the product of the electrostatic charges and ______ proportional to the square of the _______ between them directly proportional, inversely , distance
What is the previous law also known as? Coulomb's
Finish this law When an object is electrified, the ______________ the e- are distributed evenly within or outside the object.
Finish this law The charge is more concentrated ________________ along the sharpest curve of the surface.
Flow of electrons Current
What is the unit of measurement of Current? Amp
What is a circuit? Pathway for current to flow (has to be closed to flow)
What do we use to set our tube current? mA (1/1000 of amp; milliamps)
Potential difference is _______. where you have an excess of electrons at one end and deficiency at the other end
What is the unit of measurement for potential difference? voltage
What do we use to set our potential difference within the tube? kV (kilovolt- average energy), keV (kiloelectron volts - pot.diff. of each individual electron), kVp (kilovolt peak - max. potential diff. that you set)
Name four states of matter. Conductor, insulator, semiconductor, superconductor
Give an example of a semiconductor. silicon, germanium, arcelin
Which state of matter does not allow current to flow due to very high resistance? Give some examples. insulator (rubber, glass, non-sap wood)
No resistance, allows free flow of current without potential difference. Cold temps. required. Which state of matter is being described? superconductor
Copper, aluminum, silver and gold are examples of what state of matter? conductor
Give examples of a superconductor. niobium, titanium
Path for current to flow with a potential difference. Circuitry
What are the two types of circuitry? open and closed
Which circuit does not allow flow of current? open circuit
Name five sources where current can come from. battery, dynamo, solar, atomic, geothermal
Which source converts mechanical energy into electric energy? dynamo
Source that converts chemical energy into electrical energy. battery
What are the four conditions in which current will flow? vacuum, gas, ionic solutions,metallic conductor
What is resistance? opposition to current flow
Wht is the unit of measurement for resistance? ohm
what four factors determine resistance? type of material, length, diameter, temperature
What material would be considered an insulator or ground? glass or rubber
Length and resistance have a/an ______ relationship. directlonger the length, more resistance
Diameter and resistance have a/an ____ relationship. indirectsmaller the diameter, more resistance
Temperature and resistance have a/an ____ relationship. directhotter temp. , more resistance
Name some components of a circuit. resistor, battery, capacitor, ammeter, volmeter, switch, transformer, rheostat, diode, transistor
This component of a circuit stores electrical charge temp. capacitor
What is the unit of measurement for the capacitor? Farad
These two components of the ciurcuit measures amperage and voltage. ammeter, voltmeter
This component of the circuit controls mA. variable resistor
Which component of the circuit allows us to select our kVp? autotransformer
What are the two sides of a circuit? primary (low voltage) and secondary (high voltage)
Opens/closes main circuit and is located on the primary side of the circuit switch
What are the two most important components on the secondary side of the circuit? tube and rectifiers
Solid state device that converts alternating current into direct current. Rectifiers
step-up or high voltage transformers converts voltage into kilovoltage; divided between the primary and secondary sides
Over head tube works at _____ or _____ while the undertable tube works at ______ or _____ 3-5 amps or 6-10 volts; .5-5 mA or 6-10 volts
Rotor motor turns the rotor on
Name the two types of circuits? series or parallel
Series circuit all elements are connected in line along the same conductor.
Parallel circuit contains elements that bridge conductors
Ammeters always connected in ____ circuit while voltmeters are always connected in _____ circuit. series, parallel
What is the advantage of having a parallel circuit? If one section of the circuit does not work the rest of the circuit will still function
What is the formula for Ohm's Law? V= IR
Solve this problem.V (voltage) = 220 v ; I (amperage) = x ; R (resistance) = 10 I= 22 amps
Direct current electrons flow in one direction only
Electrons alternate in different directions like sine waves. Alternating current
Wavelength distance from crest to crest or trough to trough
What is the unit of measurement of wavelength? angstroms
Frequency is the _______. number of wavelengths
______ is the unit of measurement of frequency. hertz
Height of a wave. amplitude
Rate of doing work. Power
What is the unit of measurement for power? watt
What formula is used to determine total power? P= IV(I= amperage, V= voltage)
Solve this problem. I = 120 ; V= 1.5; what is the total power? P=IVP=120(1.5) = 180 watts
due to heat resistance. Power loss
What formula is used to determine power loss? P = I^2R
State the formulas for the following:ohm's law, power, power loss, total resistance in a parallel circuit Ohm's law - V=IRPower - P=IVPower loss - P=I^(2)RTotal resistance in a parallel circuit - 1/Rr = 1/r1 + 1/r2 + 1/r3
__________ occurs because of the movement of negative electric charges. Electrification
Differentiate between static electricity and electrodynamics. Static electricity is the study of electrons at rest. Electrodynamics is current flow (charges in motion)
Friction causes a/the ______ charge to be transferred to an uncharged body. same
Contact causes a/the _______charge to be transferred to an uncharged body. same
Induction causes a/the _____ charge to be conferred to an uncharged body coming into the field of a charged body. opposite
Give an example of the following:insulator material, conductor material, semiconductor material insulator - rubberconductor - aluminumsemiconductor - silicon
What is the standard international unit of electrostatic charge? coulumb
Define potential difference and state unit of measurment. excess of electrons at one end and a deficiency at the other end unit: voltage
Define tube current and state unit of measurment. flow of electrons within tube unit: mA
Define filament current and state unit of measurment. flow of electrons to the filament unit: amps
Define resistance and state unit of measurment. opposition to current flowunit: ohms
Created by: sr4095 on 2009-02-26



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