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19 Cards in this Set
- Front
- Back
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What are the regions on a magnet where the magnetic force is strongest?
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Magnetic Poles
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The south pole of a magnet will______the south pole of another magnet.
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repel
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A device that uses an electromagnet to measure electric current is a __________
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galvonmeter
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The and interactions of magnets are referred to as ___________
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magnetism.
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What is formed by placing a piece of iron inside a current-carrying coil of wire.
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Electromagnet
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A machine that changes electrical energy to mechanical energy a ______, used to do work such as turing a fan.
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electric motor
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A device that produce an electric current by rotating a coil of wire in a magnetic field.
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generator.
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When referring to the of a magnet, when is the mangnetic field strongest and weakest?
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Magnetic field is strongest closest to the magnet and weakest further away.
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Magnetic Poles?
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regions where the magnetic force exerted by the magnet is strongest.
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Magnetic field always what to the Nort and South poles?
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Magnetic fields always connect to the North and South poles.
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Why does a compass work?
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Earth has a magnetic field known as the north and south pole.
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Electromagnet? Uses?
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temporary magnet made by placing a piece of iron inside a current carrying a coil of wire. Uses: stereo speakers, electric motors, gauges in cars(gas, temp.), most appliances with moving parts.
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Why is an Electromagnet a temporary magnet?
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the magnetic field is only present when current is flowing in the wire coil.
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What can produce magnetic fields?
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moving charges, like electric current running through a wire.
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The magnetic field around the wire forms a ________
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circular motion.
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What are the two ways the strength of the magnetic field can be increased?
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1. lightening the wire coil around the piece.
2. increase the current passing through the wire. |
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Galvonmeters?
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gauges in cars, (gas,temp) that uses and electromagnet to measure electrical current.
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Electic Motor? Ex.
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electromagnetic device that changes electrical energy into mechanical energy. Ex: electric fan, electric can opener, almost every appliance with moving moving parts.
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How do generators produce electric current?
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by rotating a coil of wire in a magnetic field. As the coils turn within the magnetic field of the permanent magnet, an electric current flows through the coil.
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