Electronic workshop Lecture5 Inductors and Transformers Dr Imtiaz

Inductors • Generally - coil of conducting wire – Usually wrapped around a solid

Inductors • Values specified in henries (H), millihenries (m. H) and microhenries (μH). •

Inductor types Molded inductor & air-wound inductor Ferrite core toroidal transformer Adjustable air-wound inductor

Inductor ratings • Wire gauge and physical size of the coil determine the current

Inductor handling • Inductors are not polarized and may be installed in either direction.

Inductor Applications • Speakers • Solenoid Valves • Resonant Circuits

Task#1 • An ideal inductor would exhibit zero resistance but a real inductor has

Transformers • A transformer is a device that uses a pair of coils/windings to

Transformers • The voltage/current at the output of the transformer is given by the

Task#2 S N. o 1. 2. 3. 4. 5. Peak to Peak Input Voltage

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Electronic workshop Lecture-5 Inductors and Transformers Dr. Imtiaz Hussain email: imtiaz. hussain@faculty. muet. edu. pk URL : http: //imtiazhussainkalwar. weebly. com/

Inductors • Generally - coil of conducting wire – Usually wrapped around a solid core. If no core is used, then the inductor is said to have an ‘air core’.

Symbols

Inductors • Values specified in henries (H), millihenries (m. H) and microhenries (μH). • Inductor can be fixed value or variable. Fixed Value Inductor Variable Inductor 4

Inductor types Molded inductor & air-wound inductor Ferrite core toroidal transformer Adjustable air-wound inductor Air wound inductor Iron powder toroidal inductor 5

Inductor ratings • Wire gauge and physical size of the coil determine the current handling capacity. • Core material will have a temperature dependence. • Air is best, followed by iron powder, then ferrites. 6

Inductor handling • Inductors are not polarized and may be installed in either direction. • Mechanical stress due to lead bending should be minimized. • Inductors in timing or frequency determining circuits should be installed in a mechanically rigid fashion. 7

Color Coding

Inductor Applications • Speakers • Solenoid Valves • Resonant Circuits

Task#1 • An ideal inductor would exhibit zero resistance but a real inductor has some finite resistance. • Inductors which have become open will show infinite resistance, whereas shorted inductors will show a resistance of zero Ohms. • Take few resistors and check them for any faults.

Transformers • A transformer is a device that uses a pair of coils/windings to manipulate AC voltage and current. • It uses the principle of mutual induction to either decrease or increase the voltage/current at its input.

Transformers

Transformers • The voltage/current at the output of the transformer is given by the following equation:

Task#2 S N. o 1. 2. 3. 4. 5. Peak to Peak Input Voltage Output Voltage Turn Ratio

To download this lecture visit http: //imtiazhussainkalwar. weebly. com/ END OF LECTURE-5