Electrodynamics Flashcards

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1
Q

Faraday’s law:

A

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

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2
Q

AC

A

Alternating current. Current which reverses direction periodically.

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3
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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4
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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5
Q

DC:

A

Direct current. Current flowing in one direction only.

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6
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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7
Q

Induced emf:

A

The total amount of electrical energy supplied per unit positive charge.

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8
Q

Magnetic fields:

A

Produced by magnets or by moving electrical charges. Magnetic field lines
are drawn to represent the direction of the magnetic field at a point. The
symbol for magnetic field is B and its unit is the Tesla (T).

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9
Q

Magnetic flux density:

A

A representation of the magnitude and direction of the magnetic field.

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10
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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11
Q

Magnetic flux linkage:

A

The product of the number of turns on a coil and the flux through a coil (NФ).

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12
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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13
Q

Diode:

A

A component that only allows current to flow in one direction.

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14
Q

Generator:

A

A device which converts mechanical energy into electrical energy.

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15
Q

Motor:

A

A device which converts electrical energy into mechanical energy.

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