Inductors Flashcards
The inductor is a component that has the ability to ___________.
The inductor is a component that has the ability to concentrate a magnetic field.
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To induce voltage in an inductor, the current flow must be____?
increasing or decreasing
Increasing current in a circuit causes an expanding magnetic field in the inductor.
What is the effect of a expanding magnetic field by the inductor in the circuit?
The expanding magnetic field creates another voltage by the inductor that is opposite the applied voltage. The induced voltage opposes the increasing current flow and total circuit current remains at 0 Amps.
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If an AC voltage is applied to an inductor the current is constantly _____ and the inductor is constantly _________.
If an AC voltage is applied to an inductor the current is constantly changing and the inductor is constantly opposing circuit current.
As AC current increases, the inductor _____ circuit current. As current decreases, the inductor ______ circuit current.
As AC current increases, the inductor decreases circuit current. As current decreases, the inductor increases circuit current.
What are the three classifications of inductors (L)?
Air Core
- used as frequency filters and to keep circuit current at a constant level.
- The schematic symbol is a wavy line.
Iron Core
- values are larger due to the conductive material in the core.
- iron core enables the inductor to produce a larger magnetic field.
- Schematic symbol includes two lines indicating the iron core.
Variable
- Varying values of inductance used in transmitters and receivers.
- Schematic symbol contains an arrow indicating an adjustment.
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What is Inductance?
Inductance is the ability of a conductor to induce (generate) voltage when “cut” by magnetic flux.
What is the symbol for inductance?
The symbol for inductance is L.
What is the basic unit of inductance? How is it measured?
The henry (H) is the basic unit of inductance.
A millihenry is equivalen to what?
One-thousandth of a henry or 1 x 10-3
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A microhenry is equivalen to what?
One-millionth of a henry or 1 times 10-6.
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What are the factors that determe inductance?
Number of turns of wire on coil
Distance between windings
Cross-sectional area of core
Permeability of core
What is permeability?
The ease with which a material can be magnetized.