Malaysia SPM Form 5 Physics - Electromagnetism
1.1 Introduction to Magnetism 1.2Straight Wire and Coil 1.3 Solenoid 1.4 Uses of Electromagnet 2.1 Catapult Force 2.2 Application of Catapult Force	3.1 Electromagnetic Induction 3.2 DC and AC Generator 4.1 Transformer 4.2 Transformer - Calculation 5.1 Generation and Transmission of electricity

Transformer

The SPM Physics Workbook is developed under the One-School.net Free Books Project. The content of this book is strictly follow Malaysia SPM (Sijil Pelajaran Malaysia) syllabus. The aim of this project is to provide a complete electronic supplementary network for students to develop self-learning skills by breaking the spoon-feed rituals and to encourage them to compile educational information from the Internet.

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1. What is the suitable material to be used as the core and coil in a transformer?

	Core	Coil
	Copper	Soft iron
	Steel	Copper
	Soft iron	Copper
	Copper	Steel

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2. What are the relative numbers of turns on the two coils of a step-down transformer?

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3. What is the function of a step-down transformer?

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4. Why does a transformer have a core made of iron?

I. Iron is a conductor of electricity
II. Iron has a high melting point.
III. Iron is ferromagnetic material
IV. Iron is electromagnetically soft

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5. Which of the following statement is NOT TRUE about an ideal transformer?

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6. Which of the following is not the source energy lost in a transformer

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7. Which of the following is used to reduce eddy current in a transformer?

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8. Which of the following is used to reduce flux leakage in a transformer?

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9. A transformer manufacturer found that one of the sources of energy lost in and transformer is magnetisation and reversal of magnetisation of the iron core. Which of the following method can be used to overcome this problem?

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10. The frequency of the alternating current in the secondary coil is always __________ the frequency of the current in theprimary coil.

Magnetic Field
A magnetic field is a region in the surrounding of a magnet which a magnetic material experiences a detectable force.

Malaysia SPM Form 5 Physics - Electromagnetism

Transformer