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| A lot or a little. If you move a magnet quickly through a lot of coiled wire, you produce ______ _______ of voltage. |
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| A lot or a little. If you move a magnet slowly through coiled wire you produce ____ ___________ voltage. |
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| What did Faraday and Henry discover? |
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Definition
| Electric current could be produced in a wire by moving a magnet in or out of a wire coil. |
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Term
| More or less. It takes _________ work or effort to push a magnet quickly through several coils of wire than to push it slowly through a small number of coils of wire. |
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Term
| Name a machine that produces electric current by rotating a coil within a stationary magnetic field. |
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| An electric motor converts _________________ energy into _________________ energy. |
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| A generator converts ______________________ energy into ____________________ energy. |
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Definition
| Voltage in a coil: ↑loops, ↑rate of field changes, ↑voltage induced. Voltage in a coil: ↓loops, ↓rate of field changes, ↓ voltage induced. |
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Term
| A device for increasing or decreasing voltage through electromagnetic induction. |
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Definition
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Term
| State the Transformer equation. |
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Definition
| (Primary voltage/# primary turns) = (Secondary voltage/#secondary turns) |
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Term
| In a step-up transformer, is conservation of energy true? |
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Definition
Yes.
Power into Primary = Power out of secondary
P=P
VI=VI
VI=2V(1/2I) |
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Term
| What happens at the critical speed for an electromagnetic wave? |
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Definition
| If electric charges are set into motion at a critical speed, the magnetic field induced re-induces the electric field. The electric and magnetic fields continually regenerate each other. |
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