electricity

electricity

Open Ended

what are the types of electric charges

Multiple Choice

The plastic film and the balloon are able to affect each other’s motion because they are charged. What does this tell you about how electric charge causes the objects to interact with each other?

• Electric charges decrease Earth's gravity around objects

• Electric charges produce a force between the two objects

• Electric charges change the density of objects

Multiple Choice

Water molecules are neutral. Even though the electric charges are balanced in each molecule, one side of the molecule is slightly positive and the other side is slightly negative. Why does the stream of water bend toward the negatively charged balloon in the bottom photo?

• The electric force of the balloon pushes the negative part of the water molecules away, and the positive side is attracted to the balloon.

• The electric force of the balloon pushes the positive part of the water molecules away, and the negative parts of the molecule are attracted to the balloon.

• The electric force of the balloon causes positive charges in the water molecules to move to the balloon, leaving the water with a negative charge.

• The electric force of the balloon causes negative charges in the water molecules to move to the balloon, leaving the water with a positive charge.

Multiple Choice

How is the person in the photos separating the charges in her hair and the balloon?

• The person is squeezing charges out of the balloon.

• The person is holding the balloon in positively charged air

• The person is moving to a charged location in the room.

• The person is creating friction by moving the balloon back and forth.

Multiple Choice

What do you notice about the net charges of the balloon and the hair after electric charges moved between them?

• The total charge on the balloon has the opposite sign of the total charge on the hair.

• The balloon and the hair have the same number of negative charges

• The balloon and the hair have the same number of positive charges.

• The total number of positive and negative charges on the balloon and on the hair decreases.

Poll

Preventing charge from building up is necessary on some job sites. The buildup of charge may be a safety hazard or could damage products. A company wants to design a device to minimize the buildup of charge on an object. Which of the following materials would be the best choice to make such a device out of?

• use aluminum that transmits charges

• use rubber that do not transmit charges

• use new plastic that partially transmits

Multiple Choice

The wall did not seem to have a charge until the negatively charged balloon was put near it. With a partner, consider the options and determine how the wall could have become charged.

• The wall transferred electric charges to the balloon

• The balloon transferred electric charges to the wall.

• Positive charges in the wall moved to align with the balloon’s negative charges.

• The wall gained positive charges to balance the balloon’s extra negative charges.

Multiple Choice

During thunderstorms, positive and negative charges in clouds become separated. Positive charge builds up on the top of clouds, and negative charge builds up on the bottom of clouds. How might the charged clouds affect the charges in the neutral ground below the clouds? Select the statement that describes what happens to the charges in the ground

• Positive charges are created in the ground.

• Negative charges move from the ground to the cloud.

• Positive charges move from the clouds to the ground

• Negative charges move away from the top of the ground