1. Energy Basics

2. Energy Makes Everything Happen  You eat food  Food provides the energy to work  A car drives  Gasoline provides the power

3. Energy is divided into two types Depends on whether the energy is moving or stored

4. Types of Energy n Energy that is stored Potential Energy n Energy that is moving Kinetic Energy

5. Examples of Kinetic and Potential Energy

6. Units of Energy Measurement Y British Thermal Unit (BTU) Y Joule (J)

7. BTU The amount of heat needed to raise the temperature of one pound of water by 1 o F n 1 Btu equals about: –One kitchen match n 1000 Btu equals about –1 avg candy bar –4/5 peanut butter & jelly sandwich n 2000 Btu equals about –the amount of energy to make a pot of coffee

8. Joule 948 joules = 1 Btu 4 It takes about 2 million joules to make a pot of coffee 4 1 joule is the amount of energy needed to lift one pound about 9 inches

9. Kilojoule (kJ) 1000 j= 1 kJ A piece of buttered toast contains about 315 kJ of energy. With that energy you could: ý Jog for 6 min. ý Bicycle for 10 min ý Sleep for 1.5 hrs ý Run a car at 50 mph for 7 seconds ý Light a 60 watt light bulb for 1.5 hrs

10. Energy cannot be created or destroyed Enery can only be changed from one form into another form of energy

11. Some Energy Interconversions n Stored energy in a flashlight’s batteries becomes light energy when turned on n Food contains energy stored as chemical potential energy. Your body uses the stored energy to do work. n Overeating stores food energy as potential energy in the form of fat n When talking on the phone, your voice is changed into electrical energy. The phone on the other end changes the electrical energy into sound energy.

12. Categories of Primary Energy Z Energy Income (Renewable resources) –resources being continuously regenerated Z Energy Capital (Non-renewable) –use of such resources permanently reduces the quantity

13. Available Energy Sources Renewable –Hydroelectric energy –Tidal forces –Biomass –Geothermal heat –Wind –Solar input –Ocean thermal gradients Non-renewable –Crude oil –Natural gas –Coal –Nuclear fission –Synthetic oil

14. Global Energy Fluxes

15. Primary Energy Consumption World consumption has increased more than 10 fold in 20th Century Causes: n World population grew 2.5 fold n Increased mechanization in industrialized countries

16. Historical Trends in Energy Consumption