Electricity (Chapter 20)

2. the ability to do work
5. the relationship of voltage, current, and resistance: (V=IR)
6. the SI unit of power (equal to one joule per second)
8. a device that converts chemical energy into electrical energy
9. a flow of charge
10. connection between an electric conductor and the earth
13. law stating that the total electric charge in an isolated system is constant; electric charge is never created or destroyed
16. a force that opposes the motion of objects that touch as they move past eachother
18. opposition to flow of electric charges in a material
19. the maximum displacement of a medium from rest position
20. a material that has almost zero resistance when cooled
23. the transfer of charge without contact between two materials
25. property that causes subatomic particles such as protons and electrons to attract or repel eachother
27. a push or pull that acts on an object
28. conversion of chemical energy to electric energy within a storage battery

1. connection between two conductors that allows an electric current to flow
3. the rate of doing work
4. voltage, or the difference in electrical potential energy between two places in an electric field
7. an electric circuit with two or more paths through which charge can flow
11. potential difference, the difference in electrical potential energy between two places in an electric field
12. a complete path through which charge can flow
14. flow of electric charge that reverses its direction
15. object that doesn't allow heat, electricity, light, or sound to pass through it
17. created when two objects that are not good electric conductors rub on eachother
20. an electric circuit with only one path through which charge can flow
21. switch that opens when current in circuit is too high
22. object that conducts heat, electricity, light, and sound
24. a flow of charge in one direction
26. effect and electric charge has on other charges in the space around it is the charges electric field