Electrodynamics Flashcards

1
Q

Magnetic flux density

A

Is a representation of the magnitude and direction of the magnetic field.


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2
Q

Magnetic flux linkage

A

Product of the number of turns on the coil and the flux through the coil.


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3
Q

Faraday’s law of electromagnetic induction

A

The emf induced is directly proportional to the rate of change of magnetic flux (flux linkage)


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4
Q

Lenz’s law

A

The induced current flows in a direction so as to set up a magnetic field to oppose the change in magnetic flux


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5
Q

Diode

A

A component that only allows current to flow in one direction


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6
Q

AC: Alternating current

A

Current which reverses direction periodically.

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7
Q

Commutator:​

A

A device which ensures that the direction of the current in a coil is reversed every half revolution.

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8
Q

Conventional current

A

The rate of flow of positive charge from the positive terminal of the cell to the negative terminal.

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9
Q

DC: Direct current

A

Current flowing in one direction only

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10
Q

Electromagnetic induction

A

Occurs when a current is induced in a closed conducting loop when there is a change in the magnetic flux passing through the surface area of the conducting loop.

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11
Q

Magnetic flux

A

For a loop of area (A) in the presence of a uniform magnetic flux density (B), the magnetic flux (Ф) passing through the loop is defined as Ф = BA cosθ, where θ is the
angle between the magnetic flux density (B) and the normal to the loop of the area (A).

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