BASIC ELECTRICAL THEORY EXAM

1. The proton carries a single unit positive charge equal in magnitude to the electron charge.

2. The electrons attraction to the nucleus is called __________ .

3. The Electrostatic Field is a force acting between charged objects that causes Them to repel or attract.

4. To produce current, the electrons must be moved by a potential difference.

5. Atoms with only one valence electron make good ____________ .

6. Conventional Current Flow is current flow from positive to negative potentials.

7. Electron current, or amperage, is described as the movement of free electrons through a conductor.

8. Resistance is defined as all opposition to current flow.

9. In 1827, George Simon Ohm discovered that there was a definite relationship between voltage, current, and resistance in an electrical circuit.

10. Magnetism is a result of ___________ spinning on their own axis around the nucleus.

11. In magnetic materials, the atoms have certain areas called domains.

12. Domains are aligned such that their electrons tend to spin in opposite directions.

13. The law of magnetism states that like magnetic poles repel and unlike magnetic poles attract.

14. The group of magnetic field lines emitted outward from the north pole of a magnet is called magnetic flux.

15. Air, which is nonmagnetic, has a very high BH profile.

16. The permeability (μ) of a magnetic material is the ratio of B to H.

17. The magnetic flux in an iron core lags behind the magnetizing force.

18. The hysteresis loop is a series of curves that show the characteristics of a magnetic material.

19. The maximum number of electrons that can fit in the outermost shell of any atom is 18.

20. The electrons in the outermost shell are called valence electrons.