The Generator Effect and Magnetic Flux (Leaving Cert Physics): Flashcards

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The Generator Effect and Magnetic Flux
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Electromagnetic induction

Changing magnetic field creates current in conductor

EMF stands for

Electromotive force

Generator effect

Mechanical energy converted to electrical energy

Condition for electromagnetic induction

Magnetic field must be changing (not just present)

Stationary magnet near coil

No current flows

Magnet moving away vs towards coil

Current flows in opposite directions

Magnetic flux definition

Amount of magnetic field passing through an area

Magnetic flux symbol

ΦΦ (phi)

Magnetic flux formula

Φ=BAΦ = BA

Unit of magnetic flux

Weber (Wb)

1 weber equals

1 Wb=1 T\cdotpm21 \text{ Wb} = 1 \text{ T·m}^2

Lenz's law

Induced current opposes the change that produced it

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