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Energy Basics

Energy Basics. You eat food  Food provides the energy to work A car drives  Gasoline provides the power. Energy Makes Everything Happen. Energy is divided into two types. Depends on whether the energy is moving or stored. Types of Energy. Energy that is stored

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Energy Basics

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  1. Energy Basics

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

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

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

  5. Examples of Kinetic and Potential Energy

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

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

  8. Joule948 joules = 1 Btu • It takes about 2 million joules to make a pot of coffee • 1 joule is the amount of energy needed to lift one pound about 9 inches

  9. Kilojoule (kJ)1000 j= 1 kJA piece of buttered toast contains about 315 kJ of energy. With that energy you could: • Jog for 6 min. • Bicycle for 10 min • Sleep for 1.5 hrs • Run a car at 50 mph for 7 seconds • 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 • Stored energy in a flashlight’s batteries becomes light energy when turned on • Food contains energy stored as chemical potential energy. Your body uses the stored energy to do work. • Overeating stores food energy as potential energy in the form of fat • 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 • Energy Income (Renewable resources) • resources being continuously regenerated • Energy Capital (Non-renewable) • use of such resources permanently reduces the quantity

  13. 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 Available Energy Sources

  14. Global Energy Fluxes

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

  16. Historical Trends in Energy Consumption

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