Electricity and Magnetism Review

1. Ze'Rhyia and Allison each rub identical balloons quickly against their hair, creating negative charges in both balloons. What will most likely happen if the two place their balloons near each other?

• They will repel each other because they each have the same charge.

• They will attract each other because they each have the same charge.

• Both balloons will release their negative charges into the air and become postiviely charged.

• One balloon will transfer its negative charge to the other and both will become positively charged.

2. 2. Look at the pictures of objects below and their current charge. Which picture shows objects that will most likely attract one another?

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3. The picture shows Ivey's electromagnet. Why will the electromagnet NOT work?

• The wire needs to be connected to the battery.

• The battery should be attached to the nail, not the wire.

• The wire is supposed to wrap around the nail just one time.

• The battery needs to be larger in order to have enough power.

4. Electrical energy is the flow of electrons. Which of the following systems will allow a continuous flow of energy?

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5. Mac's diagram shows an incomplete circuit. Which component should be placed at position X to make a complete electric circuit?

• wire

• switch

• light bulb

• battery

6. Jayden wants to create a circuit to light up a bulb. He has a copper wire an a light bulb. What else does he need?

• a switch that will turn the power on and off

• an insulator that will stop the flow of electricity

• a power source like a battery

• a wire that can conduct electricity

7. Look at the picture of MJ's circuit. What is most likely the reason why the bulb is not lighting up?

• The switch needs to be closed to conduct electricity.

• The wires are attached to the battery incorrectly.

• The light bulb needs to be attached closer to the battery.

• The wire that is used is not conducting energy properly.

8. Carter creates a circuit using a AA battery, wires and a light bulb. When the battery dies, he replaces it with a stronger battery. What will most likely happen?

• The light bulb will not light up.

• The light bulb will shine brighter.

• The battery will become overloaded and explode.

• The wire will not conduct as much electricity.

9. Many electrical wires are wrapped in a rubber to prevent shocks or burns from the wires. Rubber is used for the purpose because it is a 

• poor electrical and conductor.

• good electrical and conductor.

• good electrical conductor but poor conductor.

• poor electrical conductor but good conductor.

10. What is the main difference between conductors and insulators?

• Insulators are postiviely charged and conductors are negatively charged.

• Electrical currents move through conductors better than insulators.

• Electrical currents move through insulators better than conductors.

• Conductors have a neutral charge and insulators have a negative charge.