Understanding Electricity

What is electricity?

• A form of energy resulting from the movement or presence of charged particles.

• A type of magnetism.

• A chemical reaction.

• A form of sound energy.

Which of the following is an example of static electricity?

• A light bulb glowing.

• A phone charging.

• Shuffling your feet on carpet and then touching a doorknob.

• A fan spinning.

Explain how an electromagnet works.

• It uses a permanent magnet to attract metal objects.

• It creates a magnetic field when electric current flows through a coil of wire.

• It uses static electricity to generate a magnetic field.

• It uses chemical reactions to produce magnetism.

Why does increasing the number of wire coils strengthen an electromagnet?

• It increases the resistance.

• It decreases the voltage.

• It increases the magnetic field.

• It decreases the current.

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Describe the relationship between electricity and magnetism.

• They are unrelated phenomena.

• Moving electric charges produce both electric and magnetic forces.

• Magnetism is a type of electricity.

• Electricity can only exist without magnetism.

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If you increase the battery voltage in an electromagnet, what happens to the magnetic field?

• It weakens.

• It disappears.

• It strengthens.

• It remains unchanged.

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How does the thickness of a wire affect the strength of an electromagnet?

• Thicker wires allow more current to flow, increasing strength.

• Thicker wires decrease the magnetic field.

• Thicker wires have no effect on strength.

• Thicker wires reduce the voltage.

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Predict what would happen if you rub a balloon on your hair and then bring it close to small pieces of paper.

• The paper will catch fire.

• The paper will be repelled by the balloon.

• The paper will be attracted to the balloon.

• The paper will dissolve.

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Evaluate the effectiveness of using an electromagnet in a junkyard crane.

• It is ineffective because it cannot lift heavy objects.

• It is effective because it can be turned on and off to pick up and release metal objects.

• It is ineffective because it uses too much electricity.

• It is effective because it can lift non-metal objects.

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What is the unit of measurement for electric current?

• Volts

• Amperes (amps)

• Ohms

• Watts