Unit 3 Lesson 1 Electric Charge and Static Electricity

1.   Which of the following best describes electric charge?

• A. a force that causes objects to heat up

• B. a high-voltage material that can cause damage to objects

• C. a fundamental property that causes electric and magnetic interactions

• D. a particle that moves freely through matter and causes static electricity to build up on objects

2.   Peter’s teacher tells him that he should not place his electric stereo near the edge of a pool because the water in the pool is a conductor. What does she mean when she says that the water is a conductor?

• A. Water is a type of electrical energy.

• B. Water damages electric circuits.

• C. Electric charges cannot flow without water.

• D. Electric charges move through the water in the pool.

3.   When Bethany walks across a carpet, her socks pick up many negative electric charges. Later in the day, these negative charges are no longer present on her socks. What most likely happened to the negative charges?

• A. The charges disappeared.

• B. The charges transferred to another object.

• C. The charges switched from negative to positive.

• D. The charges broke apart into smaller positive and negative particles.

4.   An engineer is building an electronic device. She wants to use a material that will give her the most control over the amount of electric charge that flows through a circuit. Which material should she use?

• A. a conductor

• B. an insulator

• C. a semiconductor

• D. a tube

5. The following image shows two circular objects. Each object has an electric charge, as shown:

What will happen to these objects when they are placed near each other?

• A. The objects will remain still.

• B. The objects will both move to the left.

• C. The objects will move towards each other.

• D. The objects will move away from each other