EGEE 101 Exam 1
A wind turbine costs $10 million to construct and generates $1 million worth of electricity per year. When has the wind turbine paid for itself (what is the pay-back period)?
10 years
If you have 200 lbs of coal in your shed and you burn 1 pound a day, how long will it last
200 days
Example of potential to Kinetic
A bowling ball descends from the top of the back-swing and contacts the floor smoothly
Example of Electrical to Chemical
A cell phone plugged in and its battery is recharged
turning a fuel into electricity that is available in your home.
A fuel is burned in a boiler
Example of Heat to Chemical
A lab attendant cooks up a batch of chemical compounds
Example of Radiant to Chemical
A plants leaf makes sugar in the afternoon
Example of Kinetic to Potential
A power company pumps up water from a river up into a mountain lake
Example to Heat to Radiant
A star shines in space
List of electromagnetic wave radiant energy forms in order, from longest wavelength to shortest, from lowest frequency to highest.
AM radio, microwave oven, heat from a person or pet, incandescent light bulb, UV - black light, dental X rays, gamma rays from a radioactive element
Example of radiation
An object loses heat to the environment via electromagnetic waves.
Energy stored in the bonds between atoms
Chemical
Kevin lives next to a power plant that burns coal. He wants to be more green, so he buys an electric car that he can plug into his home electricity. What is powering Kevin's car?
Coal
The energy of flowing electrons
Electrical
Definition of Conduction
Heat Flows from warmer to cooler by contact between the materials
Definition of Convection
Heat flows from one place to another because the heated material itself moves.
What is the biggest use of energy in a home
Heating and air conditioning
Where does coal come from
Humid swamps millions of years ago
Example of Chemical to Heat
I eat a bagel and fell asleep for 8 hours
The energy of moving things
Kinetic Energy
The energy released when atomic nuclei split or fuse
Nuclear
The energy an object has due to its position
Potential Energy
Energy transmitted via electromagnetic waves
Radiant
What do you think "embedded" energy is?
The energy that goes into making something
Example of conduction
The hot coffee heats the mug which heats my hands which are holding the mug.
Example of Kinetic to Heat
The pads in a car's disk brakes slow the car and gets hot
Example of Kinetic to Electrical
The spinning armature in a generator pushes electrons through a wire
Example of convection
The warm winds blow and heat from the tropics ends up in Pennsylvania.
Definition of radiation
The wavelength of these waves is determined by the temperature of the object, with cooler objects giving off longer wavelengths.
The energy of heat or temperature
Thermal
Example of Heat to Kinetic
Very hot, high pressure steam spins a turbine
Units of energy
kilowatt hour, calorie, joule, BTU
Units of power
watt, horsepower
