1. Energy Introduction

2. What is Energy? Energy can be defined as the ability to do work
Units: energy is measured in several ways
Newton (acceleration of 1 kg to 1 m/s2)
Joules (kilojoules for large values)
Force of one Newton over one meter
Watts (kilowatts for large values)
Joules per second (a rate value)

3. Types of Energy Kinetic Energy: moving objects exert a force
Wind energy -wind mill
Falling water -saw mill
Heat/Light: photons, U.V., heat
Chemical Reactions, often unusable energy

4. Types of Energy Continued
Chemical Energy:
Stored in chemical bonds – released as heat
Wood, coal, natural gas
Stored in the nucleus -fission, fusion
Nuclear Energy:
Energy from the splitting of Atoms
Fission

5. Types of Energy Continued
Sound
Energy transferred as waves through collision of air particles

6. Energy in the Environment
The ultimate source of energy in our global ecosystem is THE SUN!
Direct or Indirect Energy
What does our sun do?
Heats the earth; this drives global wind patterns and the water cycle

7. Energy & The Sun Example 1: Light Energy to Motion/Heat
Plants use photosynthesis to make sugar molecules (Chemical)
Humans/Animals ingest plants (Heat, Motion)
We use that energy to accomplish things

8. Main Uses Transportation Heating/Cooling
oil, gas
Heating/Cooling
B) Electricity, Oil, Gas
3) Providing Power for Machines/Electronics
C) Electricity, Batteries

9. Measuring Energy
Power: The rate at which work is done, usually measured per second or hour -Unit of measure is Watts(W) To find energy used, multiply the power rating (in watts) by the number of hours it is used -Gives you Watt Hours (WH) or Kilowatt Hours(k-WH)

10. Measuring Energy
Example: 100 W light bulb used for 24 hours uses: 100 × 24 = 2400 watt-hours (Wh) Since there are 1000 watt-hours in 1 kilowatt hour, this is 2400 1000 = 2.4 kilowatt hours (kWh) -On average, one household uses 35 kWh per day

11. Improving Energy Use Conservation Efficiency
Find ways to use less energy
i.e standby mode, electric cars, longer batteries, etc….
Efficiency
Better use of energy (More bang for your buck)
I.E. Smaller batteries with stronger energy

12. Improving Energy Use
3) Renewable Energy 1) Green Energy Sources 2) i.e Wind, tidal, solar, etc….