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ENERGY

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ENERGY Energy is the capacity to do work or to produce heat. Forms of Energy Energy comes in many forms, but they can be conveniently classified into three categories. – PowerPoint PPT presentation

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Title: ENERGY


1
ENERGY
2
What is energy?
  • Energy is the capacity to do work
  • or to produce heat.

3
Forms of Energy
  • Energy comes in many forms, but they can be
  • conveniently classified into three categories.
  • Radiant Energy
  • Kinetic Energy
  • Potential Energy

4
What is radiant energy?
  • Radiant energy is energy given off by the
  • sun that can travel through empty space.

5
Examples of Radiant Energy
  • Visible light
  • X-rays
  • Radio waves

6
What is kinetic energy (KE)?
  • Kinetic energy is energy in motion.

7
Types of kinetic energy
  • Mechanical energy
  • EXAMPLE a moving car
  • Thermal (or heat) energy
  • EXAMPLE boiling a pot of water

8
What is potential energy (PE)?
  • Potential energy is stored energy.

9
Types of potential energy
  • Gravitational potential energy
  • EXAMPLE
  • Electrical energy
  • EXAMPLE

10
Types of potential energy
  • Chemical energy
  • EXAMPLE

11
Law of Conservation of Energy
  • The law of conservation of energy states that
    energy is
  • neither created nor destroyed. It can be
  • transformed from one kind of energy into another.

12
Energy Transformation
  • Modern civilization is possible
  • because we have learned how to
  • change energy from one form to
  • another and use it to do work for
  • us and to live more comfortably.

13
SOURCES OF ENERGY
14
Measuring Energy
  • Energy can be measured using
  • a.) Calorie (C) ? the energy stored in food
  • b.) calorie (cal) ? the amount of heat needed to
    raise the temperature of 1g of water x 1C
  • c.) Joule (J) ? SI unit of energy (1 cal 4.184
    J)

15
Practice Problems
  • Conversion between calories and joules ( 1 cal
    4.184 J)
  • 1.If a container of water absorbs 25 calories of
    energy, how many joules of energy did the water
    absorb? (cal ? J)
  • (1 cal 4.184 J)

16
  • 2.If a container of water absorbs 400 joules of
    energy, how many calories of heat did the
    water absorb? (J ? cal)
  • (1 cal 4.184 J)

17
  • 3.Suppose you use 135 cal of energy to perform a
    task. How many joules have you used? (cal ? J)
  • (1 cal 4.184 J)

18
Practice Problems
  • c. 20 kilocalories ? joules
  • 20,000 cal
  • d. 2.4 kilojoules ?calories
  • 2,400 J

19
DO NOW Energy Concept Map
ENERGY
20
Energy Transformations
  • Burning gas to drive a car

chemical
thermal
mechanical
21
2.1 Review and ReinforcementCalorie and Joule
Conversions
  • 14. Convert 5.42 calories and joules. (1 cal
    4.184 J)

22
  • Convert 726.030 calories to kilojoules.
  • (1 cal 4.184 J)

23
  • 16. Convert 60.5 J to calories. (1 cal 4.184 J)
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