Energy An Introduction. Energy Learning Standard ENGR-EP-1. Students will utilize the ideas of...
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Transcript of Energy An Introduction. Energy Learning Standard ENGR-EP-1. Students will utilize the ideas of...
Energy
An Introduction
Energy Learning Standard
ENGR-EP-1. Students will utilize the ideas of energy, work, power, and force to explain how systems convert, control, transmit, and/or store energy and power
Energy Concepts
Identify types of energy surrounding us
Differentiate among renewable, nonrenewable, and exhaustible energy sources
Explain the difference between potential and kinetic energy
Name and describe the six forms of energy
Describe the history of energy consumption in the U.S.
Name various sectors of society associated with energy consumption
Summarize the present energy consumption trends in the U.S. and worldwide
Energy Concepts
Discuss the concept of efficiency
Define the law of entropy
Recognize various factors that influence the exploration and development of different energy resources
Give examples of reasons for growth in the demand for energy and power
Energy Vocabulary
Acid RainBritish Thermal Unit (Btu)Chemical EnergyEfficiencyElectrical EnergyEmbargoEnergy ConservationEnergy ConsumptionEnergy ConversionEntropyGlobal WarmingGreenhouse EffectHeat Energy
Heating UnitInexhaustible Energy SourceKinetic EnergyLight EnergyMechanical EnergyNonrenewable Energy SourceNuclear EnergyOrganization of Petroleum Exporting Countries (OPEC)Potential EnergyQuadRenewable Energy
Energy Energy
Energy is defined as the ability to do work
Energy Energy
3 Classifications of Energy
Renewable Energy Resources Nonrenewable Energy Resources Inexhaustible Energy Resources
Energy Renewable Energy Resources
Renewable energy resources are those resources that can be replaced when needed. They can be harvested and regenerated in a relatively short period of time
Food Wood Cornstalks Sugarcane
Energy Nonrenewable Energy Resources
Nonrenewable energy resources are those resources that cannot be replaced once used. Can take hundreds of thousands of years to produce these resources
Fossil Fuels Uranium
Energy Inexhaustible Energy Resources
Inexhaustible energy resources are those resources that will never run out (will last for millions of years)
Sun Water Wind Tidal/Wave Motion
Energy Types of Energy
All energy can be classified in to two types
Potential Energy Kinetic Energy
Energy Types of Energy
Potential energy is energy that is stored and ready for use
Gasoline in a tank Water behind a hydroelectric dam Rollercoaster at the top of the lift Drawn bow
Energy Types of Energy
Kinetic energy is often defined as energy that is in motion
Burning gasoline in an engine Water turning an turbine Rollercoaster falling Arrow being shot
Energy Forms of Energy
There are six forms of energy
Light Energy Heat Energy Mechanical Energy Chemical Energy Electrical Energy Nuclear Energy
Energy Forms of Energy
Light energy is energy that is visible to the eye. It represents a very small portion of all radiant energy, which collectively is known as the electromagnetic spectrum
Energy Forms of Energy
Heat energy, also referred to as infrared energy, has a longer wavelength that light energy. This longer wavelength does not allow heat to pass through certain materials, like glass, as readily as light energy does. Heart energy is generally not visible to the eye, but it can be measured in terms of temperature
Energy Forms of Energy
Mechanical energy is energy produced by mechanical devices, such as gears, pulleys, levers, or more complex devices, like internal combustion engines
Energy Forms of Energy
Chemical Energy is the term used to describe the potential energy locked within a substance. For instance, 50 lbs. of red oak might be capable of producing the same amount of heat energy as 15 lbs. of high-grade coal or 2 gallon of refined heating oil
Energy Forms of Energy
Electrical energy is the energy associated with the flow of electrons. Electricity is used extensively in contemporary society to power the majority of our convenience appliances
Energy Forms of Energy
Nuclear energy is the term associated with the power of the atom. It was initially harnessed during the 1940s. The initial use of nuclear energy was for war, but with the conclusion of World War II, peacetime uses for nuclear energy, such as power generation, emerged
Energy Measuring Energy
The most basic unit of energy is known as the British thermal unit (Btu). This is a small amount of energy:
The Btu is an often-referenced energy unit because all forms of energy can be related to the amount of Btu they produce
In energy for structural heating: One heating unit is equal to 100,000 Btu of energy
1 Btu = One wood-stem match burning completely
Energy Energy Consumption
When measuring energy consumption, or the use of energy resources, of a large city, country, or continent, we measure this in the Quad.
A quad is equal to 1 quadrillion Btu of energy, or:
1 Quad = 1.0 x 1015 Btu = 1,000,000,000,000,000 Btu
Energy Energy Consumption (U.S. History)
Energy sources in early America primarily consisted of wind, water, and wood
Factories were constructed near flowing water or falling water converting it to mechanical energy
Farmers used the wind to create mechanical power to pump water and grind grain
Energy Energy Consumption (U.S. History)
1800’s saw the invention of the steam engine which gave rise to the steam locomotive and the steamship
Coal replaced wood as the main energy source
Approx. the same amount of energy is produced by 15 lbs. of coal and 20-50 lbs. of wood
Energy Energy Consumption (U.S. History)
By 1900 the internal combustion engine had been perfected, which was being used to power the first automobile
Pound for pound, gasoline contains more energy that coal
When it comes to gasoline and oil, there have been times when the supply of energy has not met the demand here in the U.S.
We have come to rely on other countries to meet this demand
Energy Energy Consumption (U.S. History)
OPEC (Organization of Exporting Countries)
Consists of 12 Countries (Algeria, Angola, Ecuador, Iran, Iraq, Kuwait, Libya, Nigeria, Qatar, Saudi Arabia, United Arab Emirates, and Venezuela)
OPEC members collectively hold 79% of world crude oil reserves and 44% of the world’s crude oil production
In 1973, OPEC penalized the U.S. for it’s oil consumption by creating an oil embargo against the U.S. Restricting the trade of oil to the U.S. forces the government and car manufacturers to produce more economical (4-cylinder) vehicles, which started the energy conservation movement here in the U.S.
Energy Energy Consumption (U.S. History)
In the 1980’s, the U.S. shifted from an industrial society to a service society. This shift helped to create the personal computer and usher in the information age.
The majority of energy now consumed in the U.S. is done so by the industrial and transportation sectors
Many start up companies in the information age have focused on alternative energies
Even so, fossil fuels are anticipated to remain the dominant sources of energies here in the U.S. for the foreseeable future
Energy Energy Consumption (U.S. History)
According to the Energy Information Administration of the U.S. Department of Energy (DOE), world energy consumption will increase by over 50% by 2025
Energy Energy Conversion
Energy conversion is the changing of one form of energy into another
Technological advances, such as the development of the electric motor, the home heating, and solar collectors, allow for energy conversion
Electric motor: Converts electrical energy into mechanical energy
Furnace: Converts potential energy (fuel) into kinetic energy (heat)
Solar collector: Converts sunlight into heat
Energy Energy Conversion
Efficiency is a term used to measure the extent to which an energy form is usually converted to another form of energy
Combustion engines have an efficiency rating of 27% - 40%
Heating furnaces have an efficiency rating of up to 90%
Improving the efficiency of energy conversions devices, such as engines, furnaces, and generators, is one primary way to improve energy and power technologies
Energy Energy Conversion
Entropy is a measure of the unavailable energy in a closed system
The law of entropy states that whenever an energy form is converted from one form to another, some loss will occur; mostly as heat
Energy Energy Conversion
Energy Energy and the Environment
The consumption of fossil fuels leads to environmental problems, such as acid rain and the greenhouse effect, which leads to global warming
As the consumption of fossil fuels increase over the next 15 – 20 years, we will also see an increase in the effects from acid rain and the greenhouse effect
Energy Energy and the Environment
Conservation and recycling are just two ways of combating the increase of these effects
If each school recycles 1 ton of paper it will save the following:
6,953 gallons of water 463 gallons of oil 587 lbs. of air pollution 4,077 kWh of electricity
The U.S. produces 9,190 million tons of office paper annually