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Basic Electricity Vocab

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. One- thousandth of volt.






2. A current limiting device designed to melt and break the circuit when a specified current is exceeded. (The weakest point in a circuit)






3. Single NEGATIVE electrical charge. Orbits around the nucleus some in paths close to the nucleus - others in paths varying distance from the nucleus.






4. Occurs when a stream of electrons are caused to move through a conductor.






5. A circuit with more than one path. Current branches to flow in every available path.






6. A generator that produces alternating current.






7. A circuit with two or more paths for the current to take.






8. Those electrons in orbits farthest out from the nucleus - loosely bound and migrate from one atom to another.






9. Coil connected to the source of power on a transformer.






10. One million ohms.






11. That property of a material which determines how readily it conducts magnetic lines of flux. Opposite magnetic quality or conductivity.






12. The unit of resistance. It is the resistance through which a voltage of 1 volt will produce a current of 1 ampere.






13. A machine which utilizes magnetism to produce an EMF and consequently - an electric circuit.






14. A rod or strip composed of two metals having different rates or coefficients of expansion. Upon being heated - it bends in a direction which causes the material with the greater rate of expansion to be on the outside.






15. A complete path provided for the flow of electrons. Consists of a source - with a closed conducting path leading from the source and back to the source






16. Invisible lines along which magnetic energy travels from one pole of a magnet to the other.






17. A single electron or one of two or more electrons in the outer shell of an atom that is responsible for the chemical properties of an atom.






18. Iron and certain alloys of iron which are magnetized by artificial means.






19. (EMF) The force created by an electric generator (or by other means) which causes current to flow. (Same as Voltage - Volts - Electric Potential - Pressure).






20. The difference between the electrical condition of one point in an electric circuit and that of another point which tends to cause current to flow between two points. Measured in volts.






21. A short circuit between two energized conductors and/or an energized conductor and a grounded phase. Very high current flow.

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22. An instrument for measuring electromotive force in volts. It must be connected across the load that causes the votage drop.






23. A coil of wire designed to act as a magnet as a result of carrying an electrical current. It is usually wound on a soft iron core.






24. In a battery - the electrode which takes up the electrons returning from the external circuit.






25. The unit of electromotive force - potential - pressure - or voltage which produces a current of one ampere in a circuit having a resistance of 1 ohm. This is the force created to move electrons through a circuit.






26. A circuit in which there is resistance (load) connected both in series and parallel.






27. A circuit carrying three alternating currents whose cycles begin one after another. 120 electrical degrees apart.






28. A resistor designed so that its resistance is readily adjusted.






29. The voltage dissipation between any two points in a circuit. The voltage 'dropped' or 'dissipated' in forcing current through a resistance.






30. An instrument for measuring electric current






31. One- thousandth of a ampere






32. Transformer coil connected to the load. (Output side of a transformer regardless of voltage).






33. 1.Material itself (Atomic Structure - Good conductor or Bad) 2.Length of the conductor 3.Cross - sectional area (Size) 4.Temperature






34. A circuit with only one path for current to flow. There are no branches.






35. The space around a magnet in which the magnetic force is felt.






36. A connection of circuit of low resistance. Current through each of the end- to- end devices is exactly the same. Only one path for the current.






37. A current which reverses in direction at regularly recurring intervals - the total flow in one direction being equal to that in the other direction.






38. The time rate at which work is done or energy is transferred. When a pressure of 1 volt sends a current of 1 ampere through a resistance of 1 ohm - the power in the circuit is said to be 1 watt.






39. Fundamental constituents of matter. The 'elements' (tiny particles) which come together in various combinations to form molecules of many substances.






40. The center portion of an atom which has a positive electrical charge.






41. Positive charge of electricity. Located in the nucleus of the atom.






42. A cell which is rechargeable. Uses materials which change in compostition during delivery of current - but may be restored to original condition upon recharge.






43. The moving part of a dynamo or motor consisting of coils of wire around an iron core.






44. Those electrons in orbit nearest the nucleus - not easily dislodged from their normal orbits.






45. A device used to change the voltage of an alternating current circuit.






46. Shows relationship between Current - Voltage - Wattage and Resistance.

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47. Total and complete opposition to the flow of electrons






48. A very low resistance path placed in a circuit in such a manner as to allow an excessive current flow.






49. The rotating member of an electrical machine.






50. A unit of work or ENERGY. 1 kilowatt hour = 1 -000 watt hours