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Electrical Technology, Volume 1 by S. P. Bali

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19

Work, Power and Energy

OBJECTIVES

In this chapter you will learn about:

  • The definitions of work, power, and energy
  • Work done by an electric current
  • Electric heating
  • Methods of heating rooms
  • Types of electric heaters
  • Power in a resistance – (d.c.)
  • Power in a.c. circuits
  • Three-phase power
  • Active and reactive power
  • Kinetic and potential energy
image

Energy conversion

19.1  INTRODUCTION

Electrical machines and appliances save a great deal of manual labour. They do the laundry, wash the dishes, transport people, provide light, supply information on call and entertain us. Time is money. The time that machines save us can be used for more pleasant, ...

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