Delmar Unit 14 Magnetic Induction
eddy current - correct answer ✔A circular induced current contrary to the
main currents. Eddy Currents are a source of heat and power loss in
magnetically operated devices.
Weber (Wb) - correct answer ✔a measure of magnetic lines of flux in the
MKS system. 1Wb= 100 million lines of flux
speed - correct answer ✔rate of change
strength of magnetic field - correct answer ✔flux density
turns of wire - correct answer ✔the number of turns of wire in a coil
voltage spike - correct answer ✔a momentary increase in voltage
R-L time constant - correct answer ✔the amount of time required for the
current flow through an inductor or for the voltage applied to a capacitor to
reach 63.2% of its total value
Metal Oxide Varistor (MOV) - correct answer ✔a semiconductor device that
changes its resistance in accordance with the voltage applied across it
Lenz's Law - correct answer ✔a law that explains the relationship of
movement, voltage polarity, and magnetic field polarity that pertains to
magnetic induction
, left-hand generator rule - correct answer ✔a rule for determining the
direction of current flow through an armature when the direction of motion and
polarity of the magnetic field are known
hysteresis loss - correct answer ✔power loss in a conductive material
caused by molecular friction. hysteresis loss is proportional to frequency
Henry (H) - correct answer ✔the basic unit of inductance
exponential curve - correct answer ✔a natural curve that is the rate at which
current can rise or fall in an inductor or the rate of charge and discharge for a
capacitor
electromagnetic induction - correct answer ✔voltage produced by lines of
magnetic flux cutting a conductor
how fast can an MOV change resistance? - correct answer ✔less than 20
nanoseconds
What is a metal oxide varistor (MOV)? - correct answer ✔a bi-directional,
extremely fast-acting solid state component that exhibits a change in
resistance when the voltage reaches a certain point
What type of device can be used for spike suppression in either AC or DC
circuits? - correct answer ✔Metal Oxide Varistor (MOV)
Diodes used to prevent voltage spikes when opening circuits can only be used
in what types of circuits? - correct answer ✔DC circuits
eddy current - correct answer ✔A circular induced current contrary to the
main currents. Eddy Currents are a source of heat and power loss in
magnetically operated devices.
Weber (Wb) - correct answer ✔a measure of magnetic lines of flux in the
MKS system. 1Wb= 100 million lines of flux
speed - correct answer ✔rate of change
strength of magnetic field - correct answer ✔flux density
turns of wire - correct answer ✔the number of turns of wire in a coil
voltage spike - correct answer ✔a momentary increase in voltage
R-L time constant - correct answer ✔the amount of time required for the
current flow through an inductor or for the voltage applied to a capacitor to
reach 63.2% of its total value
Metal Oxide Varistor (MOV) - correct answer ✔a semiconductor device that
changes its resistance in accordance with the voltage applied across it
Lenz's Law - correct answer ✔a law that explains the relationship of
movement, voltage polarity, and magnetic field polarity that pertains to
magnetic induction
, left-hand generator rule - correct answer ✔a rule for determining the
direction of current flow through an armature when the direction of motion and
polarity of the magnetic field are known
hysteresis loss - correct answer ✔power loss in a conductive material
caused by molecular friction. hysteresis loss is proportional to frequency
Henry (H) - correct answer ✔the basic unit of inductance
exponential curve - correct answer ✔a natural curve that is the rate at which
current can rise or fall in an inductor or the rate of charge and discharge for a
capacitor
electromagnetic induction - correct answer ✔voltage produced by lines of
magnetic flux cutting a conductor
how fast can an MOV change resistance? - correct answer ✔less than 20
nanoseconds
What is a metal oxide varistor (MOV)? - correct answer ✔a bi-directional,
extremely fast-acting solid state component that exhibits a change in
resistance when the voltage reaches a certain point
What type of device can be used for spike suppression in either AC or DC
circuits? - correct answer ✔Metal Oxide Varistor (MOV)
Diodes used to prevent voltage spikes when opening circuits can only be used
in what types of circuits? - correct answer ✔DC circuits
