Electromagnetic Induction Flashcards

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1
Q

what is electromotive force?

A

The work done or energy per unit charge around the whole circuit by an energy source, such as a battery

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2
Q

what is electromotive force measured in

A

volts

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3
Q

formula for electromotive force

A

emf (volts) = work (J) / charge (C)

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4
Q

what is faraday’s law

A

A wire close to a constantly changing magnetic field will experience an induced electromotive force

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5
Q

what is faraday’s law

A

A wire close to a constantly changing magnetic field will experience an induced electromotive force

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6
Q

what are two ways to induce emf

A
  • Moving a magnet so that its field lines are cut by a wire.
  • Moving a wire across a magnetic field.
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7
Q

what does each finger do in fleming’s right hand rule

A
  • ThuMb: Motion
  • First finger: magnetic Field
  • SeCond finger: Current
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8
Q

when is fleming’s right hand rule used

A

when a force acts on a conductor perpendicular to a magnetic field.

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9
Q

what is Lenz’s law

A

The direction of the induced e.m.f. opposes the change that creates it.

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10
Q

how to increase emf induced

A
  • Increase strength of magnet -
  • Increase speed of motion
  • Increase force of motion
  • Increase number of turns in coil
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11
Q

how to represent current coming out of the page

A

circle with dot

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12
Q

how to represent current going into the page

A

circle with cross

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