Electricity

If you rub a balloon on your hair, it will stick to a wall.

Which of these objects develops a negative charge because of this rubbing action?

• wall

• your hair

• your hands

• balloon

Tyra and Mark produced static electricity in two balloons.

Which of the following is the best reason why the balloons push each other apart?

• The balloons have magnetic charges

• The balloons have no charges

• The balloons have opposite charges

• The balloons have the same charge

Shayna and Mike are making a list of electrical appliances that people use in their homes.

Which of the following objects best shows electrical energy being converted into mostly light energy?

• fan

• lamp

• radio

• toaster

Tasha made this model. In her model the bulb is not lit.

Which of these statements best explains why the bulb is not lit?

• The wires are connected to the wrong battery terminals.

• The bulb is burned out.

• The switch is open.

• A wire is missing.

Eileen tried each of these setups to make a working circuit.

In which setup would the bulb light?

• Setup A

• Setup B

• Setup C

• Setup D

Alicia turned on a light switch. What does turning a switch on do?

• open a circuit, allowing electricity to flow

• close a circuit, allowing electricity to flow

• open a circuit, stopping electricity from flowing

• Close a circuit, stopping electricity from flowing

Adam made a circuit. His light bulb did not light up. Which of these could NOT be the cause?

• open switch

• dead battery

• closed circuit

• loose connection

Francisco is doing an experiment to see what materials complete a circuit. Which activity will NOT be part of his experiment?

• recording observations

• gathering opinions

• interpreting data

• making a plan

Ashley is classifying some objects as conductors or insulators. What is the difference between conductors and insulators?

• A conductor allows electrical current to flow through it easily, while an insulator does not.

• An insulator allows electrical current to move through it easily, while a conductor does not.

• A conductor has a static charge, while an insulator does not.

• An insulator is a metal, while a conductor is not a metal.

Greg is using a circuit to test materials to determine which ones are good insulators. What happens when he tests a good insulator?

• He gets an electrical shock.

• No current flows through the circuit.

• A strong current flows through the circuit.

• The current flowing through the circuit flows weakly and then strongly.