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20 Cards in this Set
- Front
- Back
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you can increase the strength of an electromagnet by: |
adding loops to the coil |
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A transformer that ___________ voltage has more loops of wire in its primary coil than in its secondary coil |
decreases |
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An electric fan plugged into a wall outlet runs on _________ current. |
alternating |
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The current in an electric motor comes from |
the amount of current flowing |
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When the wire loop of a __________ turns, an electric current is produced |
generator |
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the current produced by a generator is _________ current |
Alternating |
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A motor ______ an electric current as it turns |
uses |
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A device that increases or decreases voltage of electric current passing through a power line is a _____________ |
transformer |
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If the secondary coil of a transformer has more turns than the primary coil, the transformer is a _____________ transformer |
step-down |
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Magnetic Domain |
a group of atoms whose magnetic poles are aligned |
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magnetism |
Properties of magnets and their interactions |
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Magnetic poles |
places on a magnet where the magnetic field is the strongest |
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galvanometer |
a device that uses an electromagnet to measure electric current |
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electric motor |
a device that changes electrical energy into mechanical energy, such as that used to turn an electric fan |
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electromagnet |
temporary magnet made by placing a piece of iron inside a coil of wire that carries an electric current |
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Direct current |
the electric current that flows only in one direction through a wire |
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Transformer |
a device that increases or decreases the voltage of electrical current |
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electromagnetic induction |
the process of producing an electric current in a loop of wire by either moving a magnet through the loop or moving the loop through a magnetic field |
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Generator |
a device that produces electric current by rotating a coil of wire in a magnetic field |
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alternating current (AC) |
an electric current that reverses direction regularly as it flows through a wire |
