Electricity and Magnetism Unit Review

What is static electricity?

• a flow of electrons

• an electric discharge

• a repelling between electrons

• a buildup of electric charge on

  something

If a copper wire is attached to the positive and negative ends of the battery, what will be the effect?

• static electricity

• a power source

• an electric current

• an electrostatic discharge

The illustration shows an electric circuit consisting of a battery, a switch, and three light bulbs. What type of circuit is shown in the

diagram?

• closed circuit

• double circuit

• parallel circuit

• series circuit

The picture below shows a device made of a battery, a nail, and a long piece of copper wire. It converts electrical energy into a different form of energy. Which term below describes the device in the illustration?

• electric switch

• electromagnet

• electric motor

• electric generator

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What is the name for a machine that changes electrical energy into energy of motion?

• electric switch

• electromagnet

• electric motor

• electric generator

Hector rubs a comb with a wool cloth. Next, he holds the comb near, but not touching, some bits of paper on a plate. Which of the following is most likely to happen?

• The paper bits are attracted to the comb and stick to it.

• The paper bits are not attracted to the comb.

• The paper bits move away from the comb.

• A spark jumps between the paper bits and the comb.

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This diagram shows the particles that make up an atom. What is the electric charge of the atom shown?

• negative

• neutral

• positive

• static

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An electron is the particle most easily removed from an atom. Suppose the atom diagrammed in Question 7 lost an electron. What electric charge would the atom then have?

• negative

• neutral

• positive

• static

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What happens when an object with a negative charge comes near another object with a negative charge?

• The objects repel each other.

• The two objects attract each other.

• The objects both gain electric

  charges.

• The objects neither repel nor attract

  each other.

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Curtis uses a wool cloth to give a balloon a negative charge. What will happen if he holds the balloon near the wall, and why?

• The balloon will stick to the wall because a negatively charged object is attracted to an uncharged object.

• The balloon will stick to the wall because a negatively charged object is attracted to another negatively charged object.

• The balloon will not stick to the wall because a negatively charged object is repelled by an uncharged object.

• The balloon will not stick to the wall because a negatively charged object is repelled by another negatively charged object.

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