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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. Any of the spaces occupied by the orbits of a group of electrons of approximately equal energy surronding the nucleus of an atom.






2. A measuring device.






3. A unit of POWER. 1 kilowatt = 1 -000 watts






4. One million ohms.






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






6. The part of the magnet where the magnetic force is most concentrated. Commonly referred to as the North or South pole or the positive or negative poles)






7. Electric charges at rest. Caused by friction of materials - where a surplus of electrons exists and may be discharged.






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






9. One- thousandth of a ampere






10. Lines representing the direction of the magnetic force in a magnetic field.






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






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






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






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






15. The process of producing an electromotive force in a conductor as a result of the cutting of magnetic lines of force by a conductor.






16. The complete path through which the lines of force travel - leaving the north pole and re- entering the south pole.






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






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






19. An alternating current which current cycle begins earlier than its voltage cycle.






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






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






22. A unit of power; equal to 550 foot- pounds per second of approximately 746 watts.






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






24. 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.






25. Negative charge of electricity






26. Term applied to the loss of voltage in forcing current through any portion of a circuit. Different factors will cause a drop; material - size - (cross - sectional area) length - temperature.






27. The rotating member of an electrical machine.






28. A cell which is composed of certain materials which are used up during the process of delivering electric current.






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


30. The condition where the free electrons are caused to move in the same direction along or through a conductor.






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






32. An instrument for measuring electrical power. Most common use: The meter of your house to measure electrical consumption.






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


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






35. 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.






36. A rate of movement of electrons through a conductor.






37. Smallest part a substance can physically divided into composed of 2 or more atoms.






38. The unit of Electro- Motive Force






39. 1.Speed of conductors cutting lines of force 2.Strength of the magnetic field 3.Length of conductors cutting through the field






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






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






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






43. A transformer designed to lower voltage of an alternating current. Most common type of transformer used on a power system.






44. A material that has many free electrons thus allowing electric current to flow through it easily.






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






46. 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.






47. A certain force exhibited by some materials which give them the ability to attract other materials. Principally iron or its alloys.






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






49. Total and complete opposition to the flow of electrons






50. In an electrical circuit - or part of an electric circuit - the intensity of the current is equal to the electromotive force that drives it divided by the resistance of the circuit.