Electrical Energy

1. A student turns on a computer screen. What energy transformation has taken place? SC.5.P.10.4

• light energy is transformed to electrical energy
• electrical energy is transformed to light energy
• sound energy is transformed to electrical energy
• electrical energy is transformed to sound energy

2. What type of energy transformation occurs when a person hears a voice through a cell phone. SC.5.P.10.4

• light energy is transformed to sound energy
• heat energy is transformed to electrical energy
• electrical energy is transformed into sound enegy
• electrical energy is transformed into mechanical energy

3. Which of these is NOT an example of energy causing motion? SC.5.P.10.2

• sitting still on a swing
• hitting a tennis ball softly
• sliding fast down a slide
• kicking a soccer ball hard

4. Which of the following is the best example of mechanical energy? SC.5.P.10.2

• a lamp that is turned on
• a ball that is hit with a bat
• wood that is burning in a fireplace
• music that is coming from a speaker

5. A student is taking laundry out of the dryer. He notices that a sock and a sweater are stuck together. Which statement is the most likely reason the sock was stuck to the sweater? SC.5.P.10.3

• The sock and the sweater have opposite charges.
• The sock and the sweater have changing charges.
• Both the sock and the sweater have a neutral charge.
• Both the sock and the sweater have a positive charge.

6. Brett blows up a balloon and rubs it in his hair to give it a negative charge. Then he moves the same balloon near a pile of small pieces of cut-up paper. The paper pieces move toward the balloon. Why did the paper pieces move toward the balloon? SC.5.P.10.3

• Objects with opposite charges repel each other.
• Objects with the same charge attract each other.
• A charged object can attract an uncharged object.
• A charged object transfers its charge to uncharged objects.

7. Which statement is true about a basic electrical circuit? SC.5.P.11.1

• No electricity will flow through a circuit without a light bulb.
• No electricity will flow through a circuit that has an open switch.
• Electricity will flow through a circuit without a source of energy.
• Electricity will flow through a circuit that forms an incomplete loop.

8. The picture shows an incomplete circuit with a battery, a piece of wire, and a light bulb. Different points of the circuit are labeled A, B, C. and D. Where does the loose wire need to be attached for the light bulb to work? SC.5.P.11.1

• point A
• point B
• point C
• point D

9. Some objects are very good at conducting electricity and other are not. Which of the following objects would be the best conductor of electricity? SC.5.P.11.2

• wood block
• cloth square
• glass bead
• aluminum foil

10. Rubber and plastic are poor conductors of electricity. What other material is a poor conductor of electricity? SC.5.P.11.2

• copper
• steel
• glass
• gold