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Module 20 and 21: Magnetism and Electromagnetism

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Across
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A device that converts mechanical energy to electrical energy and consists of a number of wire loops placed in a strong magnetic field.
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A very small group that is formed when the magnetic fields of the electrons in a group of neighboring atoms are aligned in the same direction.
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A long coil of wire with many spiral loops that is attached to a circuit; fields from each loop add to the fields of the other loops, creating a greater total field strength.
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The process of generating a current through a circuit due a changing magnetic field or to the relative motion between a wire and a magnetic field.
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The number of magnetic field lines that pass through a perpendicular surface.
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The area around a magnet, or around any current-carrying wire or coil of wire, where a magnetic force exists.
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A device that can decrease or increase the voltages in AC circuits with relatively little energy loss.
Down
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The characteristic of magnets that they have two opposite ends called poles.
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A type of transformer in which the voltage coming out of the transformer is larger than the voltage put into the transformer.
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A type of transformer in which the voltage coming out of the transformer is smaller than the voltage put into the transformer.
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The property of a wire, either straight or in a coil, to create an induced EMF that opposes the change in the potential difference across the wire.
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A device that is used to measure very small currents.
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The wire coil of an electric motor, made up of many loop mounted on an axle or shaft that rotates in a magnetic field.
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A type of magnet whose magnetic field is produced by electric current.