Topic 5 Energy Review

4. A ________________ circuits has no gaps to stop the flow of electricity.
7. When you plug in a fan, it transforms electrical energy to _____________ energy.
9. ________________ are the building blocks of matter.
10. When sound energy vibrates quickly, it has a _________ pitch.
13. An electric current is the flow of __________________ particles.
14. After rubbing a balloon on your hair, your hair is attracted to the balloon since the balloon now has a ________________ charge.
15. In a _________________ circuit, there is only one path for the current can follow.
17. Reflection is when light ____________________ off an object; still moves in a straight line.
21. _____________________ make strong resisters.
22. A radio plugged into the wall that creates sound energy, begins with ___________________ energy.
23. A neutrally charged object and a negative charge object will __________ each other.
25. Potential energy is energy an object has due to its ________________ or state.
26. In an electric circuit, there is usually some incidental _________ energy created.
27. _____________________ materials let some light pass.
30. Rubber prevents the flow of an electric _____________________.
31. When a wire in a circuit is not connected the electric current cannot ___________.

1. _____________________ is a property of sound described as loud or soft.
2. Light travels in a _____________ line.
3. Microscopes, cameras, and other types of lenses ______________ light.
5. _____________ is the energy of motion.
6. Sound energy travels through the ____________________ of particles.
8. The __________________ of an atom is made of protons and neutrons.
11. An electric ___________________ transform one type of energy into another.
12. Humans have this _____________ energy from the food they eat.
16. A ____________________ is used in a circuit to turn a device on and off.
18. Insulators keep _________________ charges inside the pathway in a circuit.
19. In a parallel circuit, devices are connected by ___________ than one loop.
20. If the number of _________________ and electrons are equal, then an object has a neutral charge.
24. Mechanical energy is a combination of kinetic energy and _____________________ energy.
28. Electrons move away from the negative end of the battery because the same type of charges __________ each other.
29. Particles in a circuit _____________ a path to follow.