GRADE 12

DEPARTMENT OF EDUCATION

GRADE 12 PHYSICS MODULE 4

ELECTROMAGNETISM

PUBLISHED BY FLEXIBLE OPEN AND DISTANCE EDUCATION PRIVATE MAIL BAG, P.O. WAIGANI, NCD FOR DEPARTMENT OF EDUCATION PAPUA NEW GUINEA 2017

Writers Hilbert Luke

Content Editors Science Department Subject Review Committee

Language Editor Dr. Mirzi. L. Betasolo

Course Format Editor Elizabeth. W. Aimundi

GR 12 PHYS M4

TITLE

GRADE 12

PHYSICS

MODULE 4

ELECTROMAGNETISM

IN THIS MODULE, YOU WILL LEARN ABOUT:

12.4.1:

MAGNETIC FIELD AND FORCE DUE TO CURRENT

12.4.2:

ELECTROMAGNETIC INDUCTION

12.4.3:

TRANSFORMERS AND POWER LOSSES IN TRANSMISSION LINES

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GR 12 PHYS M4

ACKNOWLEDGEMENT & ISBN

Acknowledgement

We acknowledge the contribution of all Lower and Upper Secondary teachers who in one way or another helped to develop this Course.

Our profound gratitude goes to the former Principal of FODE, Mr. Demas Tongogo for leading FODE towards this great achievement.

Special thanks are given to the staff of the Science Department of FODE who played active roles in coordinating writing workshops, outsourcing of module writing and editing processes involving selected teachers of Central Province and NCD.

We also acknowledge the professional guidance and services provided through-out the processes of writing by the members of:

Science Subject Review Committee-FODE Academic Advisory Committee-FODE Science Department- CDAD

This book was developed with the invaluable support and co-funding of the GO-PNG and World Bank.

DIANA TEIT AKIS Principal-FODE

.

Flexible Open and Distance Education Papua New Guinea

Published in 2017 ?Copyright 2017, Department of Education Papua New Guinea

All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means electronic, mechanical, photocopying, recording or any other form of reproduction by any process is allowed without the prior permission of the publisher.

Printed by the Flexible, Open and Distance Education ISBN 978-9980-89-565-3 National Library Services of Papua New Guinea

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GR 12 PHYS M4

CONTENTS

TABLE OF CONTENTS Page

Title....................................................................................................................................... 1 Acknowledgement & ISBN.................................................................................................... 2 Contents.................................................................................................................................. 3 Secretary's Message............................................................................................................. 4

MODULE 12.4: ELECTROMAGNETISM Course Introduction.............................................................................................................. Learning Outcomes...............................................................................................................

5 - 72 5 6

12.4.1:

Magnetic Field and Force Due to Current ...................................................... Magnets and Magnetic Fields............................................................................. Forces Due to Current in Magnetic Field........................................................... AC and DC Electric Motors...................................................................................

7 - 30 7 - 11 12 - 17 18 - 30

12.4.2: Electromagnetic Induction................................................................................ 31 - 52 Current Induced in the Presence of a Magnetic Field...................................... 31 - 52

12.4.3: Transformers and Power Losses in Transmission Lines .............................. 52 - 63 Transformers......................................................................................................... 52 - 58 Power Losses in Transmission Lines................................................................... 59 - 63

Summary................................................................................................................................ 64 Answers to Learning Activities........................................................................................... 66 - 71 References............................................................................................................................. 72

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