electronic workshop
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Electronic workshop. Lecture-5 Inductors and Transformers. Dr. Imtiaz Hussain email: [email protected] URL : http://imtiazhussainkalwar.weebly.com/. Inductors. Generally - coil of conducting wire - PowerPoint PPT PresentationTRANSCRIPT
Electronic workshop
Dr. Imtiaz Hussainemail: [email protected]
URL :http://imtiazhussainkalwar.weebly.com/
Lecture-5Inductors and Transformers
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
4
Inductors• Values specified in henries (H), millihenries (mH) and
microhenries (μH).
• Inductor can be fixed value or variable.
Fixed Value Inductor Variable Inductor
5
Inductor types
Molded inductor & air-wound inductor Adjustable air-wound inductor
Ferrite core toroidal transformer Iron powder toroidal inductorAir wound inductor
6
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.
7
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.
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:
𝑉 𝑠
𝑉 𝑝=𝑁 𝑠
𝑁𝑝=𝐼𝑝𝐼 𝑠
Task#2
S N.o
Peak to Peak Input Voltage
Output Voltage Turn Ratio
1. 2. 3. 4. 5.
END OF LECTURE-5
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