chapter 21 & 22

3. magnet- a material that retains its magnetic properties can attract or repel other magnets and can attract magnetic materials
5. drop-the difference in voltage across an electrical device that has current flowing through it
6. current law-states that all of the current entering a circuit branch must exit again
8. used to measure large amounts of power kilowatt equals 1000 watts
10. a material that can respond to forces from magnets
14. fault interrupt-an outlet with an automatic device that protects you against electric shock
15. - a device that converts kinetic energy into electrical energy using the law of induction
16. - unit used to measure power on watt equals one joule per second
18. current - electrical current that flows in one direction as with a battery
21. current-electrical current that reverses direction at repeated intervals as with household electricity

1. the rotating disk of an electric motor or generator
2. Circuit-an electric circuit that has only one path for current
4. induction - the process of using a moving magnet to create a current
7. circuit- a branch in a circuit with zero or very low resistance
8. hours- a unit of energy to one kilowatt of power used for one hour , equals million joules
9. motor - a device that converts electrical energy into mechanical energy
10. declination- the difference between true north and the direction a compass points
11. a magnet created by a wire carrying electric current
12. device that switches the direction of electrical current the electromagnet of an electric motor
13. Power-the rate at which electrical energy is changed into other forms of energy
17. device with a thin wire that melts and breaks an overload circuit
19. Circuit-an electric circuit with more than one path or branch
20. breaker -an automatic device that trips like a switch to turn off an overload circuit