7.3 Producing Electric Current

Which of the following is a form of electromagnetic induction?

• producing electric current by moving a magnet through a wire loop

• using an electromagnet to measure electric current

• producing mechanical energy by sending electric current through an electromagnet

• changing electrical energy to mechanical energy that produces sound

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Which of the following devices produces electric current?

• 1. generator

• 1. stereo speaker

• 1. galvanometer

• electric motor

Which of the following best describes how electricity is generated for homes?

• 1. The spinning of a windmill's blades creates electric current without a generator.

• Nuclear reactions produce an electric current inside the reaction chamber.

• Steam pushes turbine blades in a generator, which changes the mechanical energy into electrical energy.

• Water released from a dam generates electric current, which is transformed into mechanical energy.

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Which of the following devices can increase or decrease the voltage of an alternating current?

• 1. generator

• transformer

• battery

• galvanometer

Why do power plants commonly produce alternating current?

• 2. It is less hazardous to use than direct current.

• Less resistance is created in the wire.

• Direct current requires the use of transformers.

• The voltage of alternating current can be increased or decreased with a transformer.

The generation of a current by a changing magnetic field is called _____________.

• magnetism

• electromagnetic induction

• an electromagnet

• direct current

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A device that uses electromagnetic induction to transform mechanical energy into electrical energy is a _________________.

• electromagnet

• magnet

• generator

• motor

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Match the following

• flow of electric charge

• Direct Current

• electric current that reverses direction periodically

• Current

• electric current that always flows in one direction

• Alternating Current

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A _______________ is a device that increases or decreases the voltage of an alternating current.

• turbine

• generator

• transformer

• motor

Match the following

• Step Down Transformer

• 
• Step Up Transformer

• 
• Motor

• 
• Generator

• 

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