Lesson 2

Chapter 1 Electricity
Section 1: Generating electrical energy
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Chapter 1 Electricity
Section 1: Generating electrical energy

Slide 1 - Diapositive

Chapter 1 Electricity
Section 1: Generating electrical energy
This lesson
  • Discussing the homework
  • A power station
  • Induced voltage
  •  Electrical power
  •  Working on exercise

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Discussing the homework

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Section 1: Generating electricity

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Electric induction

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Electrical power
Power=timeEnergy
P=tE
New physical quantity:
Power

Unit of power:
  • Watt (W) (Joule/second)
  • Kilowatt (KW) (kilojoules/second)

Formula
  • P: power (Watt) (W)
  • E: energy (Joule) (J)
  • t: time (seconds) (s)
The amount of energy something generates or uses per unit of time.


Example: An LED light has a power
of 9 watts (It uses 9 joules per second).

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Homework
Section 1, Exercise: 
3, 4, 5, 6, 8

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