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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. Electric current passing through an electrolyte which produces chemical changes in it.






2. SI; The standard metric system of units.






3. Electric and magnetic force field that surrounds a moving electric charge.






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






5. To close an electrical circuit. To establish an electrical circuit through the closing of a contact - switch or other related device.






6. The current that is gained by a transistor when it is connected in a common emitter circuit.






7. Symbol for Mega - one million.






8. Kw; One thousand watts.






9. Kwh; One thousand watt-hours.






10. The rate of transfer of energy.






11. The basic of thermal energy. The work done by the force of one newton acting through a distance of one meter.






12. A tube - pipe or trough that carries and protects electric wiring.






13. Two dissimilar metals connected at a point - that produce an electrical current whose magnitude is dependent upon the temperature at the junction point.






14. Kva; One thousand volt amps.






15. MLS; A photoelectric control that operates on pulsed infrared radiation at a specific frequency - and responds only to that frequency of pulse. MLS is used frequently in areas where ambient light may cause problems with other types of sensors.






16. The pronounced curvature in reverse voltage current that is characteristic of a diode.






17. A circuit element or components that allows signals of certain frequencies to pass and blocks signals of other frequencies.






18. NFPA;






19. UL; ~LINK~






20. A form of energy produced by the flow of particles of matter and consists of commonly attractive positively (protons [+]) and negatively (electrons [-]) charged atomic particles. A stream of electrons - or an electric current.






21. Non-conducting material used to isolate and/or insulate energized electrical components.






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






23. A circuit which may have one or many resistors and/or other various devices connected in a series so that the current has only one path to follow.






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






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






26. Resistance Temperature Detector.






27. The time delay between the output signal and the response time of the receiver of the signal.






28. A meter used to measure units of volts.






29. A highly accurate bridge configuration that is used to measure three-wire RTD thermometers.






30. 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.






31. Mm; One thousandth of a meter.






32. MA; One thousandth of an amp.






33. See; 'Maximum Power Rating'.






34. A Solid State relay is a switching device that completes or interrupts a circuit electrically and has no moving parts. A Mechanical relay is an electromechanical device that closes contacts to complete a circuit or opens contacts to interrupt a circu






35. A switching device used in switching high DC loads. It contains a small permanent magnet which deflects arc in order to quench it.






36. IEC;






37. The magnitude and time phase of a quantity - represented by a plotted line.






38. Normally Closed.






39. A temperature scale. Also known as centigrade. Sea level water will freeze at 0






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






41. (ampere)The basic unit of current in an electrical circuit. One ampere is the rate of flow of electric current when one coulomb of charge flows past a point in the circuit in one second. Symbolically characterized by the letter 'I' and sometimes 'A'






42. The rate at which electricity flows - measured in amperes - 1 ampere = 1 coulomb per second.






43. That part of a circuit which is physically interconnected.






44. A three terminal semiconductor device. In a 'FET' the current is from source to drain because a conducting channel is formed by a voltage field between the gate and the source.






45. The unit for capacitance. A capacitor that stored one coulomb of charge with one volt across it will have a value of one farad.






46. An electrical resistor composed of semiconductor material - whose resistance is a known rapidly varying function of temperature.






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






48. An ionized gas containing about equal numbers of positive and negative charges - which is a good conductor of electricity - and is affected by a magnetic field.






49. 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(-).






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







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