Energy Charges
Forms of Energy
Energy Transformations
More Energy!
EXTRA :)
100
What types of charges attract?
Positive and Negative
100
During a storm, the power goes out at Randall's house. His mother strikes a match to light a candle. As the match burns, it gives off light energy. What other form of energy does the burning match give off?
Thermal energy
100
When Derrick plugs in his bedroom lamp he notices that the wire is covered with plastic. Why does the wire have a plastic covering?
The plastic is an insulator to protect people from the electricity.
100
A pencil is sitting on the desk. What type of energy does the pencil have because it is on the desk?
Potential energy
100
What is the difference between an insulator and a conductor?
An insulator does not have electrons that are free to move, and a conductor does.
200
If a positive charge and a negative charge were brought next to each other what would happen?
They would attract
200
Katie and her family are watching a fireworks display at an outdoor Fourth of July celebration. The fireworks store chemical energy, and when they are set off, they give off two forms of energy: light and ______ ?
Sound energy
200
Eric made toast for breakfast by putting a slice of bread into the toaster and turning it on. What energy transformation did he use to make a piece of toast?
Electrical energy into heat energy
200
Why are metals useful for making electrical wires?
Metals are conductors
200
What form of energy cooks food in a solar cooker?
Light energy
300
Electric charges that are the same _____ each other?
Repel
300
Bobbie is playing with his remote-controlled car by using a handheld remote box. What type of energy is being used to power Bobbie's car?
Electrical energy
300
When a radio is turned on, what energy transformation occurs?
Electrical energy is changed to sound energy.
300
A pathway for electricity to travel is called _________ ?
Circuit
300
What is the electric charge of a neutral atom from which an electron has been removed? A. Negative B. Neutral C. Nucleus D. Positive
D. Positive
400
Mrs. Edmands uses a wool cloth to give a balloon a negative charge. What will happen when she holds the balloon near the wall, and why?
The balloon will stick to the wall because a negatively charged object (balloon) is attracted to an uncharged object (wall).
400
Miguel is rolling a ball down a hill. This is an example of which form of energy?
Mechanical energy
400
What energy transformation occurs when a fan is plugged into a wall?
electrical energy into energy of motion
400
You use energy transformation every day. Which of these is a way that you would use the transformation of electrical energy to motion energy? A. taking an elevator to the top of a tall building B. listening to your MP3 player while walking to school C. turning the lamp on your desk so you can see to do your homework? D. watching your favorite TV show
A. taking an elevator to the top of a tall building
400
Jim has a toy with a spring inside of it. If you push down the spring and then releases it, the spring will pop up through the air. Which type of energy does the spring have as it flies through the air? A. Electrical and Thermal B. Kinetic and Potential C. Potential and Electrical D. Thermal and Kinetic
B. Kinetic and Potential
500
An object has an electric charge of +12. It loses 10 electrons. What is the new electric charge on the object?
+22
500
Latisha notices that when she rubs her hands together, they feel warm. Which of the following is the best explanation for why this happens? A. energy is reflected into her hands B. heat energy is produced by the friction C. light energy of the Sun heats her hands D. energy is absorbed from the air molecules by her hands
B. heat energy is produced by the friction
500
Which of the following lists the forms of energy that electricity can be transformed into?
A. heat, kinetic, light, and sound energy B. chemical, heat, light, and solar energy C. heat, kinetic, nuclear, and sound energy D. gravitational, kinetic, solar, and sound energy
500
What effect does decreasing the number of coils around the core have on the strength of the electromagnet?
It becomes weaker
500
Jennifer is getting ready for school on a cold day in February. She wants to make sure her hair is completely dry before she leaves her house. She plugs her hair dryer into the wall outlet and turns it on. Which of the following describes one of the steps involved in using energy to dry Jennifer's hair? A. Thermal energy is changed into mechanical energy, which makes the motor in the hair dryer move. B. Electrical energy is changed into heat energy, which makes the motor in the hair dryer move. C. Mechanical energy is changed into heat energy, which makes the motor in the hair dryer move. D. Electrical energy is changed into mechanical energy, which makes the motor in the hair dryer move.
D. Electrical energy is changed into mechanical energy, which makes the motor in the hair dryer move.
M
e
n
u