Chapter 30 Concepts - Induction & Inductance Flashcards
define induction
the process of producing current and emf
discuss faraday’s law of induction
an emf is induced in a loop when the number of magnetic field lines that pass through the loop is changing
define magnetic flux
created when a loop enclosing an area is placed in a magnetic field; units: 1 T*m^2 = 1 Weber (Wb)
what causes the magnetic flux to change for a coil?
1) change magnetic field magnitude
2) change area of the coil
3) change the angle between the magnetic field and the plane of the coil
describe Lenz’s Law
an induced current has a direction such that the magnetic field due to the current opposes the change in the magnetic flux that induces the current
how are eddy currents formed?
If a conducting plate replaces the loop interfering with the magnetic field and slowly removes it, the electrons swirl in place
discuss induced electric field
a changing magnetic field produces an electric field
if the magnetic field is increasing, the electric field will be present
if the magnetic field is decreasing, the electric field will move in the opposite direction
discuss the electric potential for induced electric fields
not possible dude
what are the units for inductance?
1 (T*m^2)/A = 1 Henry (H)
define self-induction
in any conductor, a double blank appears whenever a current changes over time
discuss faraday’s law for self-induction
the magnitude of the current has no influence on the magnitude of the induced emf; only the rate of change of the current counts
discuss the self-induced potential difference
only possible across an inductor because it’s outside the range of changing flux
define an RL circuit
contains a resistor and an inductor
define mutual induction
basically just a more formal way of saying induction; helps distinguish from double blank
