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Basic Electricity Vocab

Subject : engineering
  • Answer 50 questions in 15 minutes.
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  • Match each statement with the correct term.
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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 material which can be magnetized - principally iron.

2. The rotating member of an electrical machine.

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

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

5. 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.

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

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

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

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

10. Any device which may be placed in the circuit and which offers opposition to the flow of electrons around the circuit.

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

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

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

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

15. Several secondary cells connected together for either a greater voltage or current output.

16. Single POSITIVE electrical charge - located in the middle of an atom.

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

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

19. An instrument for measuring electric current

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

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

22. Total and complete opposition to the flow of electrons

23. Opposition to current flow

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

25. 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.

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

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

28. One millionth of an ampere.

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

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

31. A unit of power.

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

33. Meter used to measure resistance in an electrical circuit.

34. 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.

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

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

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

38. 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.

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

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

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

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

43. 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.

44. 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)

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

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

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

48. 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.

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

50. 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.