Electricity Unit Review

3. Electricity generated using light energy from the sun.
6. The ratio of useful energy output to energy input, expressed as a percentage.
7. The unit used to measure electric current.
10. The unit used to measure electrical resistance.
11. A method of charging without direct contact.
14. A facility where turbines and generators convert energy sources into electricity.
16. An electric cell that cannot be recharged because its chemical reaction is not reversible.
18. A circuit with multiple paths for current; if one part breaks, others still work.
21. The process of removing excess charge by connecting an object to Earth.
22. What opposite charges do when near each other.
24. A charge with more electrons than protons.
25. Natural electrical discharge often linked to conductors and insulators.
27. The energy stored in fuels like coal or petroleum.
28. Energy provided by the flow of electrons in a circuit, measured in Joules.

1. Type of current where electrons flow in one direction.
2. Type of current where electrons move back and forth.
4. What like charges do when near each other.
5. Uses radioactive materials to produce heat without burning, for electricity generation.
8. A device that reduces the flow of electric current in a circuit.
9. The SI unit of electric charge; the amount carried by a 1-ampere current in one second.
12. The ability of a material to allow electrons to move freely from atom to atom.
13. Coal or gas burned to produce heat for generating electricity.
15. Energy sources like coal, petroleum, and natural gas with low efficiency rates.
17. A method of charging by rubbing two objects together.
19. The device in a circuit that uses electrical energy.
20. A sequence showing how energy changes from one form to another.
23. The buildup of electric charge on the surface of an object.
26. Positively charged particle located in the nucleus.