This document contains notes from a technology education class taught by Mr. Saiful Hadi on transformers. It outlines the learning objectives, which are to understand what transformers are, identify types and working principles, and learn the formulas. It then discusses the definition of a transformer, the types of step-up and step-down transformers, their working principles, formulas, examples of calculations, and applications. The document appears to be lecture slides for a class on transformers.

1. BBD 20202 | Technology Education | En. Saiful HadiGroup Pioneer | Section 13
Faculty of Technical and Vocational Education
PIONEER TEAM
Lecturer :
MR. SAIFUL HADI B MASRAN

2. BBD 20202 | Technology Education | En. Saiful HadiGroup Pioneer | Section 13
Faculty of Technical and Vocational Education
Izuan Aiman b Ismail
Nur Shaheera bt Zainurin
Nor Asmida bt Mahusin
Mohamad Rosalhafis b Rosly
Nur Hayathul Addin bt Abdul Aziz

3. BBD 20202 | Technology Education | En. Saiful HadiGroup Pioneer | Section 13
Faculty of Technical and Vocational Education

4. BBD 20202 | Technology Education | En. Saiful HadiGroup Pioneer | Section 13
Faculty of Technical and Vocational Education
• To understand what is the
transformer
• To identify the types and
working principle of the
transformer
• Get to know the formula
and how to use it.
Learning Outcomes

5. BBD 20202 | Technology Education | En. Saiful HadiGroup Pioneer | Section 13
Faculty of Technical and Vocational Education
 What is transformer
 Type of transformer
 Difference of transformer
 Working principle of transformer
 Transformer’s formula
 How to use transformer
 The application
SUBTOPIC

6. BBD 20202 | Technology Education | En. Saiful HadiGroup Pioneer | Section 13
Faculty of Technical and Vocational Education
An equipment
used to raise or
lower the potential
difference of an
alternating current
supply.

7. BBD 20202 | Technology Education | En. Saiful HadiGroup Pioneer | Section 13
Faculty of Technical and Vocational Education
Step-Up
Transformer Step-Down
Transformer
T Y P E O F
RT A N S F O R M E R

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Faculty of Technical and Vocational Education
Step-Down TransformerStep Up Transformer
Difference

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Faculty of Technical and Vocational Education
Working Principle

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Faculty of Technical and Vocational Education
Step-Down Transformer
Step-Up Transformer
Formula
&

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Faculty of Technical and Vocational Education

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Faculty of Technical and Vocational Education
Calculation
The figure above shows a transformer in a high
voltage supply.
i. State the type of transformer.
ii. What is the value of Ns ?
Vp Vs

13. BBD 20202 | Technology Education | En. Saiful HadiGroup Pioneer | Section 13
Faculty of Technical and Vocational Education
Solution
i. Step-up transformer
ii.

14. BBD 20202 | Technology Education | En. Saiful HadiGroup Pioneer | Section 13
Faculty of Technical and Vocational Education
Calculation
The figure above shows a being used to
operate a 6V heater from a 240V a.c. supply.
i. State the type of transformer.
ii. The number of turns in the primary coil, Np ?
Vp Vs

15. BBD 20202 | Technology Education | En. Saiful HadiGroup Pioneer | Section 13
Faculty of Technical and Vocational Education
Solution
i. Step-down transformer
ii.

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Faculty of Technical and Vocational Education

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Faculty of Technical and Vocational Education
Applications
Laptop
Transformer
Mobile Charger
X-Ray Television
Electric Welding
RadioTelephoneDigital Camera

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Faculty of Technical and Vocational Education
Do you have any
QUESTIONS?

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Faculty of Technical and Vocational Education
Conclusion

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Faculty of Technical and Vocational Education
End