Terms : Hide Images
| 9302648143 | alternating current | A/C | 0 | |
| 9302648144 | direct current | D/C | 1 | |
| 9302648145 | electromotive force | E.M.F | 2 | |
| 9302648146 | volts | Electromotive Force is measured in _________________. | 3 | |
| 9302648147 | amps | Current is measured in _______________________. | 4 | |
| 9302648148 | ohms | Resistance is measured in ____________________. | 5 | |
| 9302648149 | watts | Power is measured in ________________________. | 6 | |
| 9302648150 | actual | In __________________ current flow theory electrons flow from negative to positive. | 7 | |
| 9302648151 | electricity | ___________________ is the flow of electrons in a conductor. | 8 | |
| 9302648152 | conventional | In __________________ current flow theory electrons flow from positive to negative. | 9 | |
| 9302648153 | current | ______________ delivers electrical power to its point of use. | 10 | |
| 9302648154 | direct current | ______________________ electricity flows in only one direction. | 11 | |
| 9302648155 | positive | The highest potential of current flow in conventional current theory is the ___________ terminal. | 12 | |
| 9302648156 | negative | The lowest potential of current flow in conventional current theory is the ___________ terminal. | 13 | |
| 9302648157 | circuit | Any path that allows the electrons to leave the power supply an return to the power supply is called a | 14 | |
| 9302648158 | battery | A _____________ is a common source of DC current. | 15 | |
| 9302648159 | alternating | _____________ current flows alternately in one direction and then the other. | 16 | |
| 9302648160 | 60 | The AC electricity produced in the U.S cycles ___________ times per second. | 17 | |
| 9302648161 | hertz | Frequency is measured in _______________. | 18 | |
| 9302648162 | farads | Capacitance is measured in ______________. | 19 | |
| 9302648163 | 120 VAC (Volts Alternating Current) | A standard household wall outlet has a voltage supply of __________ volts. | 20 | |
| 9302648169 | parallel | What type of circuit is this? |  | 21 |
| 9302648170 | variable resistor | Name this symbol. |  | 22 |
| 9302648180 | actual current theory | Name the theory. Electrons flow from negative to positive. | 23 | |
| 9302648181 | conventional current theory | Name the theory. Electrons flow from positive to negative. | 24 | |
| 9302648182 | 5V or 5VDC | How do you write 5 volts DC? | 25 | |
| 9302648185 | single pole single throw | SPST stands for | 26 | |
| 9302648189 | off | Before checking for continuity, make sure the voltage is turned _______________. | 27 | |
| 9302648191 | voltage | Potential difference refers to _____________________. | 28 | |
| 9302648194 | parallel | In a __________________ circuit, the voltage available to each branch is equal to the source voltage. | 29 | |
| 9302648196 | 24 volts | According to Kirchhoff's voltage law for series circuits, if a series circuit has a resistor with a voltage drop of 5 volts and another resistor with a voltage drop of 19 volts, what is the source voltage? | 30 | |
| 9302648197 | direct short | A circuit breaker that trips immediately indicates a __________________________. | 31 | |
| 9302648198 | circuit breaker | What is this symbol? |  | 32 |
| 9302648199 | thermal circuit breakers | What do the symbols on the right side of this disconnect represent? |  | 33 |
| 9302648200 | 60 Hertz | What is the Hertz in North America? | 34 | |
| 9302648201 | farad | What is the unit of measurement for capacitance? | 35 | |
| 9302648202 | henry's | What is the unit of measurement for inductance? | 36 | |
| 9302648203 | to resist changes in current flow | What is the purpose of an inductor? | 37 | |
| 9302648205 | least resistance | Electricity follows the path of ________________. | 38 | |
| 9302648208 | volt amperes | Transformers are usually rated in units called | 39 | |
| 9302648209 | micro | What does the symbol µ represent? | 40 | |
| 9302648210 | micro | What is the value of the prefix µ? | 41 | |
| 9302648211 | milli | What is the value of the prefix m? | 42 | |
| 9302648212 | mega | What is the value of the prefix M? | 43 | |
| 9302648213 | 1,000 | What is the value of the prefix k? | 44 | |
| 9302648215 | 1/10th | It only takes _________________ of an amp to kill you. | 45 | |
| 9302648216 | insulator | Material that does not conduct electricity very well. Tightly wound 7-8 valence eletrons. | 46 | |
| 9302648217 | switch | Basic electrical component to open and close a circuit. | 47 | |
| 9302648218 | normally closed | Switch contacts which are opened when acted upon by an operator. | 48 | |
| 9302648219 | normally open | Switch contacts which are closed when acted upon by an operator. | 49 | |
| 9302648220 | common | Switch contact that incoming power is connected to. | 50 | |
| 9302648221 | voltage | The potential difference between two points in a circuit is called ___________________. | 51 | |
| 9302648222 | current flow | An inductor is a coil that opposes changes in ________________. | 52 | |
| 9302648223 | henrys | Inductance is measured in ______________________. | 53 | |
| 9302648224 | L | The letter that represents inductance in formulas is _____________. | 54 | |
| 9302648225 | variable Resistor | What type of resistor can be adjusted? | 55 | |
| 9302648226 | electrolytic, non-polarized, and variable | Name 3 types of capacitors. | 56 | |
| 9302648227 | potentiometer | Low voltage variable resistor | 57 | |
| 9302648228 | farads | Capacitance is measured in _____________________. | 58 | |
| 9302648229 | rheostat | High voltage variable resistor | 59 | |
| 9302648230 | CT= C1 + C2 + C3...CN | Formula for calculating Total Parallel Capacitive Reactance. | 60 | |
| 9302648231 | 3 applications of a variable resistor | 1. Lighting 2. Volume knob 3. Television controls | 61 | |
| 9302648232 | voltage divider | Circuit that uses resistors to drop source voltage to a lower voltage | 62 | |
| 9302648233 | dc | Inductance affects a ____________ circuit only when the current is first turned on, off, or there is a change in load resistance. | 63 | |
| 9302648234 | parallel | Components wired in parallel in a series-parallel circuit will display characteristics of a _______________ circuit. | 64 | |
| 9302648238 | equal | A capacitor in a DC circuit will charge to a voltage __________ to the source voltage. | 65 | |
| 9302648239 | voltage divider | Using resistors in a circuit to produce a voltage lower than the source voltage is called a ___________________ circuit. | 66 | |
| 9302648240 | 10 | The load resistance value in a voltage divider should be at least ___________ times greater than the resistance value of the voltage divider resistor. | 67 | |
| 9302648243 | volt amperes | Transformers are usually rated in units called _____________. | 68 | |
| 9302648244 | transformer | Device that transforms one AC voltage to another AC voltage or from AC to DC | 69 | |
| 9302648248 | series circuit | Only one path for the current to flow | 70 | |
| 9302648249 | parallel circuit | circuit in which electric current can follow more than one path | 71 | |
| 9302648250 | combination circuit | an electric circuit that includes both series and parallel branches | 72 | |
| 9302648251 | RT= R1 + R2 +R3 | series circuit resistance formula | 73 | |
| 9302648252 | total sum of the reciprocal of the reciprocals | parallel circuit resistance formula | 74 | |
| 9302648253 | series circuit voltage drop formula | Vs = V1 + V2 + V3 + ... | 75 | |
| 9302648254 | the same everywhere in the circuit | series circuit current is | 76 | |
| 9302648255 | total power consumed is the same as the total power supplied | series circut power | 77 | |
| 9302648256 | parallel circuit voltage | voltage is the same across each branch | 78 | |
| 9302648257 | parallel circuit current | sum of the total of the individual branch currents. | 79 | |
| 9302648258 | parallel circuit resistance | The total resistance is smaller than any individual branch. formula is (R1^-1 + R2^-1 + R3^-1......etc. ) | 80 | |
| 9302648259 | kirchhoff's current Law | The total current in a parallel circuit equals the sum of the individual branch currents | 81 | |
| 9302648260 | kirchhoff's voltage law series circuit | The total of all voltage drops in a series circuit must equal the voltage supplied by the battery | 82 | |
| 9302648261 | a combination circuit | _______________________contains both series and parallel circuts. | 83 | |
| 9302648262 | combination circuit breakdown | First find the total resistance by finding the total of parallel branches using repricols formula and then add series resistances. After the Resistance is found you can determine the current total or the voltage total. | 84 | |
| 9302648263 | conductor resistance | The amount of voltage drop and power loss over the length and type of the conductor. | 85 | |
| 9302648264 | wire size range | There are 44 steps between American wire gauge size 40 gauge to 0000 (4/0). | 86 | |
| 9302648265 | ampacity | _____________is the current carrying capacity of electric conductors expressed in amperes. | 87 | |
| 9302648266 | conductor resistance formula | RConductor= length(ft)/length units(1000ft) X resistance per length units(1000ft) | 88 | |
| 9302648267 | circular mils | 1 mil = .001 inch. 1 cmil= 1 mil squared | 89 | |
| 9302648268 | cmils and kcmil | if a conductor has a diameter of 750 mils(.750 inch) it has a cmil= 750mil squared = 562500 cmil or 562.5 kcmil standard wire sizes in kcmils 250 kcmil 300 kcmil 400 kcmil 500 kcmil 600 kcmil | 90 | |
| 9302648269 | cmil foot | a piece of wire with 1 cmil cross sectional area 1 foot long | 91 | |
| 9302648270 | resistance total of a conductor | Rc= K (resistivity constant of material) x L( length in feet) ÷ CM (area in Cmils) | 92 | |
| 9302648271 | effects on conductor ampacity rating | conductor type, wire gauge, diameter, length, insulation, temperature, air flow around the conductor | 93 | |
| 9302648272 | parallel circuit resistance formula | if all resistors are the same resistance value you can add the total and the divide by the number of resistors. A circuit with 3 resistors on 3 branches with a resistance of 24 ohms each would have a total of 8 ohms. | 94 | |
| 9302648273 | voltage | The difference in electrical potential energy between two places in a circuit is called_________________. | 95 | |
| 9302648274 | electrical current | flow of charged particles from one point to another in a circuit | 96 | |
| 9302648275 | coulomb | A unit for electric charge is called a _______________. | 97 | |
| 9302648276 | ampere | An ________________ is a measure of the rate of current flow. One_______________equals one coulomb per second. | 98 | |
| 9302648277 | ohm | An _____________ is a measurement of electrical resistance. | 99 | |
| 9302648278 | watt | A ____________ of Power. equals one joule per second. | 100 | |
| 9302648279 | horsepower | A ______________ is a common unit of power, equal to about 746 watts | 101 | |
| 9302648280 | ESA | Electrical Safety Authority | 102 | |
| 9302648281 | simple electrical circuit | source of voltage, a conductor, a load | 103 | |
| 9302648282 | resistor | An electrical device that resists the flow of electrical current | 104 | |
| 9302648283 | ohms law formulas | V=IR , I= V/R, R= V/I | 105 | |
| 9302648284 | ohms law states | 1 volt willl push one amp through one ohm of resistance. 1 amp requires 1 volt to get pushed through 1 ohm of resistance. 1 ohm if it has 1 volt applied to it will allow one amp to flow through it. | 106 | |
| 9302648285 | electrons | negatively charged subatomic particles | 107 | |
| 9302648286 | protons | positively charged subatomic particles | 108 | |
| 9302648287 | neutrons | the particles of the nucleus that have no charge | 109 | |
| 9302648288 | gluons | the substance that holds quarks together | 110 | |
| 9302648289 | quarks | _____________ are subatomic particles that make up protons and neutrons. | 111 | |
| 9302648290 | capacitor | An electrical device that stores energy in the electric field created between a pair of conductors on which equal but opposite electric charges have been placed. Measured in Micro,nano, and pico farads. | 112 | |
| 9302648291 | inductors | a coil of wire that stores energy in a magnetic field | 113 | |
| 9302648292 | static electricity | Free electrons that arent moving(they're static). Moved from one surface or body and deposited on another surface or body. One surface is positive the other is negative. They hold theses charges until they are discharged. | 114 | |
| 9302648293 | A couloumb | 6.24x10^18 charges | 115 | |
| 9302648294 | law of charges | like charges repel, unlike charges attract | 116 | |
| 9302648295 | capacitor uses | act as a barrier to direct current, geting rid of voltage spikes, energy storage for short duration high loads. | 117 | |
| 9302648296 | Stray capacitance | ___________________exists between two conductors run together such as conductors in a power cord or conductors run in a conduit. Sometimes this is called parasitic capacitence. | 118 | |
| 9302648297 | capacitance formula | C=Q/E | 119 | |
| 9302648298 | Q | charge (unknown amount of coulombs ) | 120 | |
| 9302648299 | E | electrical potential (unknown amount of voltage | 121 | |
| 9302648300 | I | Intensity of current (unknown amount of amperes) | 122 | |
| 9302648301 | C | capacitance (unknown amount of farads) | 123 | |
| 9302648302 | Inductor | An _____________ is a device that stores energy in a magnetic field which is created around a coil of wire through which current is flowing. | 124 | |
| 9302648303 | Lenz law | induced current flows in the opposite direction of the applied current (self induction) | 125 | |
| 9302648304 | emf | electromotive force | 126 | |
| 10077449268 | cemf | counter electromotive Force | 127 | |
| 9302648305 | Millihenries are related to: | Inductors, which are rated in millihenries. | 128 | |
| 9302648306 | formula for inductance | L = N( SQUARED) × P × A / length |  | 129 |
| 9302648307 | L | formula letter of an unknown value of henries | 130 | |
| 9302648308 | p | formula letter of permeability of core material | 131 | |
| 9302648309 | N sqaured | formula letter of number of turns squared | 132 | |
| 9302648310 | A | formula letter of an area of cross section of the coil in square meters. | 133 | |
| 9302648311 | factors that affect inductance | the number of turns in the coil. The cross section area of the core. The closeness of the turns. Ease of setting up magnetic lines of force. | 134 | |
| 9302648312 | inductive time constant formula | Time = L/R | 135 | |
| 9302648313 | 5 time constants of inductance when charging | 63% 86% 95% 98% 100% | 136 | |
| 9302648314 | 5 time constants of inductance when discharging | 37% 14% 5% 2% 0% | 137 | |
| 9302648315 | voltage in an inductive circuit | as the inductor voltage drops more current flows through the resistor until the resistor has all the voltage drop and the inductor has none. this happens from time constant 0 to 5. | 138 | |
| 9302648316 | the henry | A unit of measure of an inductors ability to oppose a change in current is ___________. | 139 | |
| 9302648317 | formula for inductors in series | LT = L1 + L2 + L3 + ... + LN | 140 | |
| 9302648318 | formula for inductors in parallel | 1/LT = 1/L1 + 1/L2 + 1/L3 + ... + 1/Ln |  | 141 |
