1. electric charge -- a property that causes subatomic particles such as protons and electrons to attract or repel one another; also the amount of excess or deficiency of negative or positive particles in an object. 

2. electric field -- the field around charged particles that exerts a force on other charged particles. 

3. Coulomb's law -- the relationship between electrostatic force, the sizes of electric charges and the distance between two objects. 

4. electrostatic force -- a push or pull acting on a charge due to its interaction with an electric field. 

5. attraction -- the action of two opposite charges; a pulling together due to electric fields. 

6. repulsion -- the action of two like charges; a pushing away due to electric fields. 

7. static -- an object or particle that is not moving. vector -- a measurement that requires a direction. 

8. E = F / q -- the electric field strength formula. 

9. electrical potential energy -- the amount of energy stored in the position of a charged-object in an electric field. 

10. electric potential -- the amount of electric potential energy stored in each charge.

11. potential difference -- the difference in electrical potential energy between two places in an electric field. 

12. voltage -- the potential difference measured in volts; the amount of work to be done to move a charge from one point to another along an electric circuit. 

13. Volts -- the units for voltage, representing Joules/Coulomb. 

14. Coulombs -- the units for charge. Joules -- the units for energy and work. 

15. Newtons/Coulomb -- the units for electric field strength. 

16. current -- the rate of flow of electric charges. 

17. Amperes -- the units for current, representing Coulombs/second of flow. 

18. physical current -- the (more correct) view that negative charges move from the negative pole to the positive pole through a circuit. 

19. conventional current -- the (more complicated) view that positive charges move from the positive pole to the negative pole through a circuit. 

20. generator -- a device used to convert mechanical energy into electric energy. 

21. electric motor -- a device that converts electric energy into mechanical energy.

22. electrons -- negatively-charged subatomic particles.

23. protons -- positively-charged subatomic particles. 

24. quantized -- the idea that there is a smallest unit of charge - the amount of charge found in a proton or an electron. 

25. conductor -- a material that allows electric charges to flow easily. 

26. insulator -- a material in which electrons are not able to move easily. 

27. friction -- a process by which atoms are put in contact, facilitating the transfer of electrons from one object to another. 

28. polarization -- the realignment of electric charge in a neutral insulator due to the presence of an outside electric field. 

29. inverse-square law -- a physical quantity that varies inversely with the distance-squared. 

30. electric field lines -- imaginary lines that represent how a positive test charge would move in the presence of the source charge; drawn in the direction of the actual electric field vectors and indicate relative strength of the field at a given point. 

31. law of conservation of charge -- states that electric charge can neither be created or destroyed - only transferred. 

32. electrically neutral -- an object that has equal amounts of positive and negative charges.

33. test charge -- stationary positive charge placed in an electric field to test its strength and direction. 

34. magnetism -- the property of some materials in which there is a force of repulsion or attraction between certain like and unlike poles.

35. magnetic field -- the space around an object through which a magnetic force is applied; it is produced by an electric charge in motion. 

36. magnetic field lines -- the map of forces around a magnetic object. 

37. magnetic pole -- one of two points, such as the ends of a magnet, that have opposing magnetic qualities. 

38. magnetic monopole -- a magnetic pole in isolation; it is theoretical and had never been observed. 

39. magnetic force -- the attraction or repulsion between magnetic poles 

40. unpaired electron -- a single electron in an electron shell; its spin can cause a the generation of a magnetic field inside an atom of iron, nickel or cobalt. 

41. magnetic domains -- microscopic regions inside an object made of atoms with aligned magnetic fields. 

42. electromagnetic induction -- the process of generating a flow of electric charges by moving an electrical conductor relative to a magnetic field 

43. electromagnetism -- the interaction of electric currents or fields and magnetic fields. 

44. electromagnets -- an object that generates a magnetic field when an electric current flows through it. 

45. electromagnetic waves -- transverse waves consisting of changing electric fields and changing magnetic fields 

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