Electricity

Which of the following is the best example of static electricity?

• clothes getting stuck together in a dryer

• a light bulb turning on with a switch

• a doorbell ringing when it is pressed

• using a computer to search the internet

What is one disadvantage to having an electromagnet?

• An electromagnet is a magnet that can be turned off and on.

• An electromagnet is much less expensive than a permanent magnet.

• An electromagnet is always stronger than a permanent magnet.

• An electromagnet needs a power source to operate.

Based on your knowledge of electromagnets and permanent magnets, why would cranes in a junk yard use an electromagnet instead of a permanent magnet?

• Because an electromagnet is always stronger than a permanent magnet

• Because an electromagnet is always weaker than a permanent magnet

• Because only the electromagnet attracts metal

• Because the electromagnet can be turned on and off

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

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.

Kala wants to make a simple circuit with a battery, a lightbulb, and a switch. She connects the lightbulb to the switch with one wire, and the batter with another wire, as shown in the picture. To have the lightbulb turn on, Kala must do one last step before closing the switch. Which step must she do?

• Add a wire connecting point A to point D.

• Add a wire connecting point A to point B.

• Add a wire connecting point C to point A.

• Add a wire connecting point D to point B.

Tags

NGSS.4-PS3-2

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