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16 Cards in this Set
- Front
- Back
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magnet
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is any object with a force that pushes magnets apart or pulls them together
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poles
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The parts of a magnet where the magnetic force is strongest
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Magnetic force
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a force that pushes magnets apart or pulls them together
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magnetic field
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is the area of magnetic force around a magnet
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axis
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Is the imaginary line through the center of the earth |
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compass
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is an instrument that uses 'earth magnetic field to help people find directions
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electromagnet
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is a coil of wire wrapped around a metal core such as an iron bar.
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loudspeaker
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is a device that changes electrical energy into sound
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diaphragm
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is part of the loudspeaker that vibrates to create sound
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Microphone
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is a device that uses a magnet to convert sound into electrical magnets
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motor
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is a device the changes electrical energy into mechanical energy, or motion
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shaft
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is a rod that can spin and move
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generator
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turns motion into electric energy
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turbine
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The mechanical energy for a generator is provided A simple turbine looks like an electric fan |
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alternating current
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flows in one direction and then flows in the opposite direction
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direct current
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When the flow of a current is always in one direction
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