| No. | Item | Definition |
|---|---|---|
| 1. | AC | alternating current |
| 2. | ampere | unit of current |
| 3. | amplifier | circuit increasing signal strength |
| 4. | amplitude | signal size or strength |
| 5. | anode | electrode where oxidation occurs |
| 6. | attenuation | reduction in signal strength |
| 7. | back EMF | opposing voltage from inductance |
| 8. | bandwidth | frequency range passed |
| 9. | battery | electrochemical power source |
| 10. | binary | base-two representation |
| 11. | breadboard | board for temporary circuits |
| 12. | breaker | resettable overcurrent protection device |
| 13. | cable | grouped insulated conductors |
| 14. | capacitance | ability to store charge |
| 15. | capacitor | component storing electric charge |
| 16. | cell | single electrochemical unit |
| 17. | circuit | complete electrical path |
| 18. | conductor | material allowing current flow |
| 19. | connector | device joining electrical paths |
| 20. | continuity | unbroken electrical connection |
| 21. | current | flow of electric charge |
| 22. | datasheet | component specification document |
| 23. | DC | direct current |
| 24. | decoupling | reducing unwanted signal interaction |
| 25. | desoldering | removing soldered components |
| 26. | diagnostics | fault-finding procedures |
| 27. | diode | component allowing one-way current |
| 28. | duty cycle | on-time percentage per cycle |
| 29. | electrolyte | ion-conducting battery medium |
| 30. | EMI | electromagnetic interference |
| 31. | ESD | sudden static discharge |
| 32. | fault | abnormal circuit condition |
| 33. | filter | circuit selecting frequencies |
| 34. | firmware | software stored in hardware |
| 35. | flux | cleaning agent for soldering |
| 36. | frequency | cycles per second |
| 37. | fuse | safety device that melts |
| 38. | gain | amount of amplification |
| 39. | ground | reference point for voltage |
| 40. | grounding | connecting to reference ground |
| 41. | harness | bundled organized wiring |
| 42. | heat sink | part dissipating heat |
| 43. | hertz | unit of frequency |
| 44. | impedance | total opposition in AC circuits |
| 45. | inductance | ability to store magnetic energy |
| 46. | inductor | component storing magnetic energy |
| 47. | insulator | material resisting current flow |
| 48. | integrated circuit | miniaturized electronic circuit chip |
| 49. | isolation | separation preventing direct conduction |
| 50. | joint | soldered electrical connection |
| 51. | jumper | short removable connection |
| 52. | leakage | unwanted current flow |
| 53. | LED | light-emitting diode |
| 54. | load | device drawing electrical power |
| 55. | logic | digital decision behavior |
| 56. | microcontroller | programmable control chip |
| 57. | multimeter | meter for electrical measurements |
| 58. | noise | unwanted electrical disturbance |
| 59. | ohm | unit of resistance |
| 60. | oscillator | circuit generating periodic signals |
| 61. | oscilloscope | instrument showing signal waveforms |
| 62. | overcurrent | current above safe level |
| 63. | overload | excessive electrical demand |
| 64. | overvoltage | voltage above safe level |
| 65. | phase | relative timing of waveforms |
| 66. | pin | component connection lead |
| 67. | polarity | positive and negative orientation |
| 68. | power | rate of electrical energy use |
| 69. | probe | test lead tip |
| 70. | protocol | communication rules |
| 71. | rating | maximum specified operating value |
| 72. | rectifier | device converting AC to DC |
| 73. | regulator | device controlling output voltage |
| 74. | relay | electrically operated switch |
| 75. | resistance | opposition to current flow |
| 76. | resistor | component limiting current |
| 77. | ripple | small AC variation on DC |
| 78. | RMS | effective AC value |
| 79. | schematic | diagram of circuit connections |
| 80. | semiconductor | material with controlled conductivity |
| 81. | sensor | device detecting physical change |
| 82. | signal | information-carrying electrical variation |
| 83. | socket | receptacle for component leads |
| 84. | solder | metal used to join parts |
| 85. | surge | brief high-voltage increase |
| 86. | switch | device opening or closing circuit |
| 87. | terminal | connection point for a conductor |
| 88. | threshold | level triggering an action |
| 89. | tolerance | allowed variation from nominal |
| 90. | trace | conductive path on a board |
| 91. | transformer | device transferring AC energy |
| 92. | transient | short-lived electrical event |
| 93. | transistor | semiconductor switching or amplifying device |
| 94. | troubleshooting | systematic fault investigation |
| 95. | via | plated hole between layers |
| 96. | voltage | electrical potential difference |
| 97. | watt | unit of power |
| 98. | waveform | shape of a varying signal |
| 99. | wick | braid removing molten solder |
| 100. | wire | metal conductor |