Inductor Quiz Questions
What is an inductor?
A: An inductor is a passive two-terminal
electrical component which resists a
change in electric current.
What does an inductor consist of?
A: A conductor such as a wire, usually wound into a coil.
When current flows through an inductor, energy is stored
temporarily in a what?
A: Magnetic field in the coil.
When the current in an inductor changes, the time-varying
magnetic field induces a what in the conductor?
A: Voltage.
According to Faraday’s law of electromagnetic induction,
what does the voltage do?
A: It opposes the change in current that created it.
An inductor is characterized by its what?
A: Inductance.
What is inductance?
A: The ratio of the voltage to the rate of change of current.
In what units is inductance expressed?
A: Henries (H).
Inductors have values that typically range from 1 µH
(10−6H) to what?
A: 1 H.
Many inductors have a magnetic core made of what?
A: Iron or ferrite.
What does including an iron or ferrite core do?
A: It serves to increase the magnetic field and thus the inductance.
Along with capacitors and
resistors, inductors are one of
the three passive linear circuit elements that make up what?
A: Electric circuits.
Inductors are widely used in what type of electronic
equipment?
A: Alternating current (AC), particularly in radio equipment.
What are one of the things that inductors used for?
A: To block the flow of AC current while allowing DC to pass.
What are inductors are called that are designed for this
purpose?
A: Chokes.
They are also used in electronic "what", to separate
signals of different frequencies?
A: Filters.
They are also used in combination with capacitors to make
what?
A: Tuned circuits, used to tune radio and TV receivers.
The electric current through a conductor creates a what?
A: Magnetic flux around the conductor.
Any conductor will generate a magnetic field when current
flows through it, so every conductor has what?
A: Some inductance.
The inductance of a circuit depends on the
geometry of the
current path and what?
A: The magnetic permeability of nearby materials.
In inductors, the wire or other conductor is shaped to
increase the what?
A: Magnetic field.
Winding the wire into a coil increases the number of times
the magnetic flux lines do what?
A: Link the circuit, increasing the field and thus the inductance.
What effect does adding turns have?
A: It raises the inductance.
The high permeability of a ferromagnetic core can increase
the inductance of a coil by a factor of how much?
A: Several thousand over what it would be without it.
Any change in the current through an inductor creates a
changing what?
A: Flux, inducing a voltage across the inductor.
The polarity, or direction, of the induced voltage is given
by Lenz's law, which states that it will be such as to do what to the change in
current?
A: Oppose it.
