ee40 final 1
DESCRIPTION
INDUCTORTRANSCRIPT
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inductor
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Inductor
OPPOSE THE FLOW OF AC BY temporarily storing some of the electrical energy as a magnetic field.
Consist of wire coils.
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Inductance
The ability of the wire coil or loop to store energy.
abbreviated by the letter L
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Inductance
is directly proportional to the number of turns of wire.
is also directly proportional to the diameter of the coil.
the longer the coil, the less the inductance𝛍o𝛍r AN2𝓵L = A = cross sectional area
N = no. of turns𝓵 = length of coil
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Unit of Inductance
henry, abbreviated H, represents a potential difference of one
volt across an inductor within which the current is increasing or decreasing at one ampere per second.
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Inductor in series
Without interaction
L = L1 + L2 + L3
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Inductor in Parallel
L L1 L2 L3
1 1 1 1 = + +
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Coefficient of coupling
specified by the letter k, is a number ranging from 0 (no coupling) to 1 (maximum possible coupling).
Two coils that are separated by a sheet of solid iron would have essentially k = 0
two coils wound on the same form, one right over the other, would have practically k = 1.
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is specified by the letter M is expressed in the same units as
inductance:
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Effects of mutual inductance
When two inductors are connected in series, and there is reinforcing/aiding mutual inductance between them.
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Effects of mutual inductance
When two inductors are connected in series, and there is opposing mutual inductance between them.
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Effects of mutual inductance
When two inductors are connected in parallel, and there is reinforcing/aiding mutual inductance between them.
L1L2 - M2L1 + L2 - 2ML =
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Effects of mutual inductance
When two inductors are connected in parallel, and there is opposing mutual inductance between them.
L1L2 - M2L1 + L2 + 2ML =
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Energy stored in the inductor
I2L 2 W = Joules
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Example 1
a. Find L if L1 and L2 are reinforcing.
b. Find L if L1 and L2 are opposing.
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Example 2
There are two coils with values L1 = 835 μH and L2 = 2.44 mH. They are connected in series so that their coefficient of coupling is 0.922, acting so that the coils oppose each other. What is the net inductance of the pair?
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Thank You