Electricity

Objects can be charged in many ways. In the image below, a student is rubbing a balloon on his head.

What method is he using to charge the balloon?

• friction

• repulsion

• induction

• conduction

Which of the following is an electrical insulator?

• copper

• rubber

• aluminum

• iron

The diagram below shows two examples of electrical circuits. Which of the following statements about the circuits is correct?

• Circuit 1 is a parallel circuit, and Circuit 2 is a parallel circuit

• Circuit 1 is a series circuit, and Circuit 2 is a parallel circuit.

• Circuit 1 is a parallel circuit, and Circuit 2 is a series circuit

• Circuit 1 is a series circuit, and Circuit 2 is a series circuit.

An object can become electrically charged if it gains or loses which particles?

• volts

• neutrons

• atoms

• electrons

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?

• The charges disappeared.

• The charges transferred to another object.

• The charges switched from negative to positive.

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

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 conductor

• an insulator

• a semiconductor

• a tube

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?

• The objects will remain still

• The objects will both move to the left

• The objects will move towards each other

• The objects will move away from each other.

The following table describes the resistance of two different wires. Based on this table, which of the following is most likely true?

• Wire A is longer and thinner than wire B.

• Wire A is shorter and thicker than wire B.

• Wire A is a poor conductor of electric current.

• Wire B is a good conductor of electric current.

Which of the following best describes electric voltage?

• the rate at which electric charges move

• the amount of electrical energy contained inside a battery

• the work needed to move an electric charge between two points

• the shock that a person experiences when he or she comes in contact with electricity

What is electric current?

• the rate at which electric charges pass a given point

• a material’s opposition to the flow of electric charge

• the number of electric charges that pass a given point

• the amount of work to move a unit of electric charge between two points