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 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 Demonstrate “self-inductance” of an electromagnetic coil Adapted from Make: Electronics, Oreilly, Charles Platt, v LED 220 

BE demo Hookup diagram. 9 v + push button switch 47  LED

BE demo A simple DC motor with inductive sparking Adapted from [Usborne, Electricity and Magnetism, Adamczyk and Law, 1993]

BE demo Operation of a magnetic solenoid

BE demo Operation of a Single Pole Double Throw (SPDT) relay 9 v + push button switch LED 220

BE ckt Inductive-capacitive oscillation Adapted from Make: Electronics, Oreilly, Charles Platt, v LED 330  uf LED + LM2-12 Relay

Hookup diagram for BE ckt v + push button switch 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.