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






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






3. The property of a material that opposes the flow of current.






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






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






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. Negative charge of electricity






8. 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.






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






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






11. 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.






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






13. One millionth of an ohm.






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






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

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






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






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






19. 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.






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






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






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






23. 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.






24. The unit of Electro- Motive Force






25. Total and complete opposition to the flow of electrons






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






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






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






29. 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.






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






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






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






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

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34. 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.






35. One millionth of an ampere.






36. 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.






37. An instrument for measuring electric current






38. 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.






39. A complete sequence of events - as an alternating- current cycle.






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






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






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






43. Rate of electrons flow (current flow). When one 'Coulomb' of electrons pass a given point in one second.






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






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






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






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






48. A generator that produces alternating current.






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






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