Unit 9: Circuits and Electricity Test

A diode has two terminals and is a—

• semiconductor device that controls the flow of electricity in one direction

• device that converts mechanical energy into electrical energy

• conductor made from silicon to enhance electrical signals

• temporary magnet that loses magnetism when electric current is removed

A generator converts _________ energy into __________ energy.

• mechanical energy into electrical energy

• electrical energy into mechanical energy

• thermal energy into mechanical energy

• chemical energy into electrical energy

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If an engineer is investigating a transistor, he must be trying to—

• turn the flow of electricity on and off

• enhance the magnetic properties of the conductor

• remove heat from the moving current

• insulate the electric current

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What kind of circuit is shown in the diagram?

• A) A closed, parallel circuit

• B) An open, parallel circuit

• C) A closed, series circuit

• D) An open, series circuit

A scientist wants to select a material that is a semiconductor. Which material should the scientist select?

• Plastic

• Silicon

• Glass

• Nickel

After electrons transfer energy to perform work in a circuit, what additional kind of energy is transferred to the surroundings?

• Mechanical

• Electrical

• Thermal

• Radiant

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How is the boy charging the comb?

• Friction

• Repulsion

• Conduction

• Induction

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Most of the electrical energy humans use comes from—

• A. motors

• B. electromagnets

• C. generators

• D. magnetic fields

Which statements are true about the magnets shown? The magnets are attracting each other. The magnetic field is strongest in the middle of each magnet. The magnets are repelling each other. Those poles are opposite. The magnetic field is strongest at the poles. The poles are the same.

• The magnets are attracting each other.

• The magnets are repelling each other.

• Those poles are opposite.

• The magnetic field is strongest in the middle of each magnet.

• The magnetic field is strongest at the poles.

Tags

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An engineer wants to build a prototype with a strong electromagnet core. Which would be the best choice?

• An iron core with only one coil of wire

• A glass core with multiple coils of wire

• A glass core with only one coil of wire

• An iron core with multiple coils of wire

Tags

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