Electricity and Magnetism Review

Which of the following observations would indicate that wrapping more wire has increased the strength of the electromagnet?

• The spoon now picks up seven paper clips.

• Eventually, the battery runs out of energy.

• More wire was needed to wrap around the spoon.

• The ends of the wire must touch the battery's poles. 

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What energy transfer is taking place in the generator?

• Chemical energy to kinetic energy

• Electrical energy to mechanical energy

• Mechanical energy to electrical energy

• Nuclear energy to electrical energy

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Compared to a parallel circuit, a series circuit has which of the following disadvantage?

• A series circuit requires more material to build than a parallel circuit.

• 
  The current decreases as it passes through each successive component

• The entire circuit will not work if the circuit is broken/open at any point.

• There is a limit to the number of components that can be added in a series.

What is the best explanation for why the light bulb in circuit does not light up?

• The battery is dead.

• The bulb is burned out.

• The resistance is too low.

• The resistance is too high.

How can a current be induced in a closed circuit without the use of a battery or electrical power?

• by moving the circuit into a nuclear field

• 
  by moving the circuit into a magnetic field

• by moving the circuit into a gravitational field

• by moving the circuit into a high temperature field

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What is the relationship between voltage and current?

• As voltage increases, current increases

• As voltage increases, current decreases.

• As voltage increases, current remains constant.

• There is no relationship between current and voltage.

An object that allows electricity to flow

• conductor

• electromagnet

• insulator

• resistor

Which statement is true about an electromagnet?

• It is a permanent magnet

• It can not be turned off

• It is made by wrapping current-carrying wire around an iron core.

• Increasing the number of coils decreases the strength.

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You are going to build an electromagnet.  What materials do you need?

• insulated wire, compass, iron bar

• insulated wire, iron bar, batteries and holder

• compass, iron bar, light bulbs

• iron bar, batteries and holder, light bulbs

How are current and resistance related?

• Directly.  If resistance increases, current increases.

• Directly. If resistance increases, current decreases

• Inversely. If resistance increases, current increases.

• Inversely. If resistance increases, current decreases.

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