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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 how many 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 ______________ 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 _______. 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,keV,kVp
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 what kind of relationship direct-longer the length, more resistance
Diameter and resistance have what kind of relationship indirect-smaller the diameter, more resistance
Temperature and resistance have what kind of relationship direct-hotter temp. , more resistance
what are the components of a circuit *resistiors *battery/energy source *capacitor *ammeter *voltmeter *switch *transformer *rheostat *diode *transistor
inhibits flow of electrons resistors
provides electric potential battery
momentarily stores electric charge capacitor
measures electric current ammeter
measures electric potential voltmeter
turns circuit on or off by providing infinite resistance switch
increases or decreases voltage by fixed amount (AC only) transformer
variable resistor(mA selector) rheostat
allows e- to flow in only one direction diode
switch that can amplify signals transistor
a circuit in which all elements are connected in line along the same conductor series circuit
series circuit is measured by what ammeter
a circuit that contains elements that bridge conductors parallel circuit
parallel circuit is measured by what voltmeter
an ammeter measures __________, while a voltmeter measures __________ *electric current in a circuit(quantity) *potential difference between two points in a circuit(energy)
What is the formula for Ohm's Law? V= IR or I= V/R or R= V/I *voltage across the total circuit or any part of the circuit times resistance *I=amperage *v=voltage *R=resistance
what is the formula for total resistance in a parallel circuit Rt= R1+R2+R3
what is it when electrons flow in one direction only DC(direct current) *required for xray tube
what is it when electrons alternate in different directions like sine waves. AC(alternating current)
What formula is used to determine total power? P= IV(I= amperage, V= voltage)
caused by heat resistance. Power loss
What formula is used to determine power loss? P = I^2*R
Created by: bigad1982