Download Lesson 10 Inductors

BE Lesson 10: Inductors
What are inductors and how are they used?
© 2012 C. Rightmyer, Licensed under The MIT OSI License, 20 July 2012
BE demo 10-1. Demonstrate a coil’s electromagnetic effect
1.5 Volt AA battery
is sufficient to pick
up a paper clip.
Make: Electronics, Oreilly, Charles Platt, 2009
BE demo 10-2. Demonstrate “self-inductance” of an
electromagnetic coil
220 W
9v
LED
LED
Adapted from Make: Electronics, Oreilly, Charles Platt, 2009
BE demo 10-2. Hookup diagram.
push
button
switch
47 W
+
9v
LED
LED
BE demo 10-3. A simple DC motor with inductive sparking
Adapted from [Usborne, Electricity and Magnetism, Adamczyk and Law, 1993]
BE demo 10-4. Operation of a magnetic solenoid
BE demo 10-5. Operation of a Single Pole Double Throw
(SPDT) relay
push
button
switch
+
9v
LED
LED
220
220
BE ckt 10-6. Inductive-capacitive oscillation
LM2-12
Relay
LED
LED
+
12 v
+
1000 uf
Adapted from Make: Electronics, Oreilly, Charles Platt, 2009
330 W
Hookup diagram for BE ckt 10-6
push
button
switch
+
12 v
LED
330
LED
A brief summary of component characteristics
that you have learned so far in this course
• Resistors impede current and consume voltage.
• Capacitors act like miniature batteries. They initially allow
DC current flow but when fully charged they block DC
DC current. They pass AC current.
• Inductors initially block DC current but then allow it to flow
with little resistance. After the coil’s magnetic field builds
to its steady state, self-inductance attempts to maintain the
current at its current level until the magnetic field becomes
discharged.
• Resistors, capacitors, and inductors can be designed into
circuits such as to cause various patterns of oscillation.