Test your basic knowledge |

Electrical Components

Subject : engineering
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. See; 'Maximum Power Rating'.






2. LED; A solid state light source component that emits light or invisible infrared radiation.






3. Commonly used in generators and motors - it is an electromagnet formed from a coil of insulated wire that is wound around a soft iron core.






4. A negative (-) electrode. The point of entry of electrons into a device from an external circuit. The negative electrode of a semiconductor diode.






5. Voltage; The unit of electromotive force (EMF) that causes current to flow. One volt causes a current of one amp through a resistance of one ohm.






6. The element inside a vacuum tube - incandescent lamp or other similar device.






7. Expressed in webers - it is the product of the average normal component of the magnetic intensity over a surface and the area of that surface.






8. Kw; One thousand watts.






9. Magnetically - opposite poles - north and south. In electricity - oppositely charged poles - positive and negative.






10. Ultra High Frequency






11. An electrically conductive fused salt or a solution where the charge is carried by ionic movement.






12. A device having two terminals and has a low resistance to electrical current in one direction and a high resistance in the other direction.






13. When there is current through a semiconductor p-n junction it is the resistance of a forward-biased junction.






14. A connected path to earth or to a conductive body that has a reference potential to earth.






15. A high-intensity incandescent lamp with a quartz bulb containing an inert gas of iodine or bromine vapor.






16. Applying molecular physics to electronics.






17. A small current leaking from an output device in the off state caused by semiconductor characteristics.






18. Also known as Hertz - it is the number of complete cycles of periodic waveform that occur during a time period of one second.






19. The interaction of magnetism and electrical current.






20. Symbol used to denote transformer.






21. An electrical circuit that is not 'made'. Contacts - switches or similar devices are open and preventing the floe of current.






22. A coil of wire wound about a magnetic material - such as iron - that produces a magnetic field when current flows through the wire.






23. Mm; One thousandth of a meter.






24. The unit of power. One watt equals one joule per second - 1/746th horsepower.






25. NEMA;






26. Pounds per square inch gage. Pressure in relationship to the ambient air pressure>






27. A reference point at zero potential with respect to the earth. In an electronic circuit it is the common return path for electric current. A conducting connection between the earth and an electrical circuit or electrical equipment. Also - the negativ






28. The act of the opening of an electrical circuit.






29. The maximum temperature at which a device can be safely operated.






30. kV; One thousand volts.






31. EPA; ~LINK~






32. The measured amount of electrical energy that represents the electrostatic forces between atomic particles. The nucleus of an atom has a positive charge (+) and the electrons have a negative charge(-).






33. A solid-state switching device used in switching AC wave forms.






34. IBEW;






35. The rate of transfer of energy.






36. Output power divided by input power - (work performed in ratio to energy used to produce it).






37. A panel meter with zero and span adjustments - commonly scaled for signals such as 1-5 volts - 4-20mA - etc.






38. Current Consumption. The amount of amps or milliamps needed to maintain operation of a control or device.






39. The behavior of charged particles and the steady motion of charge in magnetic and electric fields.






40. An electrical circuit that increases the power - voltage or current of an applied signal.






41. Electrical energy produced by the action of heat.






42. A device that converts AC voltage to pulsating DC voltage.






43. The resistance to electrical current. Resistance is measured in ohms.






44. An anode (+) or cathode (-) conductor on a device through which an electric current passes.






45. A region of space that surrounds a moving electrical charge or a magnetic pole - in which the electrical charge or magnetic pole experiences a force that is above the electrostatic ones associated with particles at rest.






46. A device that transfers power or energy from one system to another - such as taking a physical quality and changing it to an electrical signal.






47. A rise and fall of voltage - current - or other faction that would be constant under normal conditions. A pulse that is intentionally induced will have a finite duration time.






48. Silicone Controlled Rectifier.






49. Radio Frequency Interference.






50. A switch in a controller that manually resets after exceeding the controllers limit.