# 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

# DC and AC Generator

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.

1. The diagram above shows the simple structure of a
DC motor
DC Generator
AC Motor
AC Generator

2. What is the name of component Y in the diagram.
slip ring
split ring commutator
armature
rectifier

3. The diagram shows a generator rotating in a clockwise direction. Which of the following statements about the generator is true?
Y is a slip ring
The galvanometer shows a constant reading.
The current in the coil changes direction every half rotation.

4. Diagram shows the simple structure of a
DC motor
DC Generator
AC Motor
AC Generator?

5. Name component Y in the diagram above
Split ring commutator
Carbon brush
slip ring
armature

6. The diagram shows a generator rotating in a clockwise direction. Which of the following statements about the generator is not true?
The current in the coil always flows in 1 direction.
The current in the resistor changes direction in every half revolution of the coil.
The pointer of the galvanometer oscillates about the zero center.

7. The diagram shows an a.c. generator rotating in a clockwise direction. A maximum current will be obtained when the coil is
Horizontal
Vertical
45o with the horizontal