Term
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Definition
| a changing magnetic field from a changing current induces an emf |
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Term
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Definition
the induced emf in a wire loop is proportional to the rate of change of magnetic flux through the loop ΦB = B┴A=BAcosθ Weber, 1 Wb=1 T·m2 proportional to total number of lines passing through the loop |
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Term
| Faraday's law of induction (2) |
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Definition
&=-N ΔΦB/Δt = Blv a changing magnetic flux, ΔΦB induces and electric field |
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Term
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Definition
a current produced by an induced emf moves in a direction so that its magnetic field opposes the original change in flux used to determing direction of conventional electric current induced in a loop due to a change in ΦB |
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Term
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Definition
| opposite of a motor; transforms mechanical energy into electrical energy |
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Term
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Definition
consists of 2 coils either interwoven or linked by an iron core; a changing emf in one induces an emf in the other voltage ≈ turns (N) ≈ 1/current Vsec/Vpri=Nsec/Npri=Ipri/Isec only work if the current is changing (AC) |
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Term
| Lorentz's Force Law (electron & magnetic) |
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Definition
Felectron = evB FB = qv x B e=electron charge=1.6x10-19C |
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Term
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Definition
| when a conductor moves through a uniform magnetic field |
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