Electrical Fundamentals – ATT Test 3 – Inductors
and Magnetic Field Principles (Q&A Format)
How is a magnetic field created? current flowing through conductor
What are inductors? component with the ability to concentrate a magnetic field
(opposes changes in DC current)
What happens to current when a magnetic field expands? Increases
Voltage induced in inductor is _____ to applied voltage and _____ current
Opposite/opposes
What happens to induced voltage in an inductor with constant current? No voltage is
induced, must be increasing/decreasing
What happens when AC voltage is applied to inductor current is constantly changing and
inductor constantly opposes current
What happens once max current is reached in inductor inductor no longer opposes
current and acts like a short
, What are three types of inductors? air core, iron core, variable
What is inductance? ability of a conductor to induce voltage when "cut" by magnetic flux
What is the basic unit of inductance? Henry
What factors affect inductance? Number of turns, distance between windings, cross
sectional area, permeability
More turns in inductor results in (higher/lower) inductance? higher
Shorter inductor equals (more/less) flux density? more
Higher cross sectional area of inductor equals (higher/lower) inductance? higher
What is inductive reactance? amount of opposition to current flow
What is inductive reactance measured in? Ohms
Voltage leads current by how many degrees in inductive circuit? 90
and Magnetic Field Principles (Q&A Format)
How is a magnetic field created? current flowing through conductor
What are inductors? component with the ability to concentrate a magnetic field
(opposes changes in DC current)
What happens to current when a magnetic field expands? Increases
Voltage induced in inductor is _____ to applied voltage and _____ current
Opposite/opposes
What happens to induced voltage in an inductor with constant current? No voltage is
induced, must be increasing/decreasing
What happens when AC voltage is applied to inductor current is constantly changing and
inductor constantly opposes current
What happens once max current is reached in inductor inductor no longer opposes
current and acts like a short
, What are three types of inductors? air core, iron core, variable
What is inductance? ability of a conductor to induce voltage when "cut" by magnetic flux
What is the basic unit of inductance? Henry
What factors affect inductance? Number of turns, distance between windings, cross
sectional area, permeability
More turns in inductor results in (higher/lower) inductance? higher
Shorter inductor equals (more/less) flux density? more
Higher cross sectional area of inductor equals (higher/lower) inductance? higher
What is inductive reactance? amount of opposition to current flow
What is inductive reactance measured in? Ohms
Voltage leads current by how many degrees in inductive circuit? 90
