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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. Opposition to current flow






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






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






4. The unit of Electro- Motive Force






5. One millionth of a volt.






6. 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.

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7. 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.






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






9. A material with few free electrons. A structure or material used to prevent the passage of current.






10. 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)






11. The dissimilar metals which are placed in an electrolyte to form a cell.






12. A transformer designed to raise the voltage of an alternating current. Most common use; In a generating plant to raise the voltage.






13. The liquid solution (sometime a paste) in which the electrodes are placed.






14. (Lode Stone) Certain type of mineral ore which has the natural Properties of a magnet.






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






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






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






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






19. One millionth of an ohm.






20. Certain quantity of electrons. The unit of measure that specifies the rate at which electric current flows per second.






21. 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.






22. A material which CANNOT be magnetized. Example: Wood - Glass - Brass - Rubber...






23. The path of an electric current. To permit a steady flow of current - the path must be complete. Commonly - a complete circuit includes a device for the production of an electromotive force - connecting wires - and a device supplied with electricity.






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






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






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






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






28. A device which capacity is its chief electrical property; a device for storing or holding an electric charge; a capacitor.






29. One millionth of an ampere.






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






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






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






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






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

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






36. One- thousandth of volt.






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






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






39. A measuring device.






40. The magnetism which a material retains after the magnetic force which magnetized it has been removed.






41. The area surrounding a magnet in which magnetic properties are exhibited






42. 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.






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






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






45. Hardened steel which has been magnetized artificially and which retains its magnetic properties






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






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






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






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






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







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