Mythbusters 1, What is Electricity
"Let's blow some stuff up." Adam Savage of MythBusters. That's an appropriate quote for
Energy in Everyday Life, because this module is MythBusters I. Electricity is a modeled catch-all
word having many meanings. And unf
"People do not want electricity or oil, but rather comfortable rooms, light, vehicle motion,
food, table, and other real things." Amory Lovins.
This is SES 194 Energy in Everyday Life and this module will be on Thermal Radiators.
SES 194 Unit 6 Notes
"On graduating from school, a studious young man who would withstand the tedium and
monotony of his duties has no choice but to lose himself in some branch of science or literature
completely irrelevant to this assignment.
"I have no doubt that we will be successful in harnessing the sun's energy. If sunbeams were
weapons of war, we would have had solar energy centuries ago." George Porter, science
educator. This is Energy in Everyday Life. And today's modu
2 out of 2 points
A force is in the direction of change in motion
2 out of 2 points
Work, in the technical sense of the word, has units of Joules
0 out of 2 points
A 35 Watt light bulb is turned on for 3 seconds. How much
Unit 3 assignment
1.) At room temperature most air molecules are?
- moving about 500 m/s
2.) Roughly how long does it take a photon produced in the Sun's core to reach the surface of
- 1 million years
3.) Match the color of a photon with its rela
How many times could a car circle the earth if it could use all
the energy in a nuclear bomb as fuel?
gasoline has an energy density of ~40 MJoule/kg ~ 4e7 J/kg.
a gallon of water is ~ 4 kg, but gas is lighter (it floats on water), so
say 3 kg.
7.) Using terminology from the lecture materials, describe what
happens energetically when chemical bonds are formed and broken.
- Breaking bonds absorbs energy. Forming bonds releases energy.
8.) Make an order of magnitude estimate of the distance to the
how much power does your brain consume?
a typical daily intake is ~2000 food calories. so
~2000 kcal/day = 2000 * 1000 cal/day = 2e6 calorie.
i happen to know,geeky and whatnot, that 1 calorie is worth
~ 4 joule.so, 2e6 calorie * 4 joules/calorie ~ 8e6 jo
1.) Using terminology from the lecture materials, define energy. Explain
the relationship between energy and work. Write in complete
sentences using your favorite text editor and then past the answer into
the box provided.
- Energy is the ability to do wo
Although it is extraordinary how much can be deduced from just a little knowledge, a little knowledge is
necessary. Here are some numbers that appear in this course.
In this course we do almost all of our arithmetic using only one digit of precision (one
how much does it cost (in dollars) to operate one streetlight in
tempe for one year?
well, let's see. a streetlight is brighter than a typical household
light bulb, so i'll estimate one streetlight outputs ~300 W.
a year has ~8000 hours. i'll figure a str
At least one lemon, orange, grapefruit, or potato
At least two plastic-coated paper clips
1) Wash your pennies in soapy water, then rinse and dry them off with a paper towel.
2) Cut three alumin
1. First, rub the lemon between your hands while gently squeezing. This will release more
juices from the flesh making it more reactive for the battery.
2. Take the penny or copper wire and poke it through the skin of the lemon (into the flesh) on
At room temperature most air molecules are
about 500 m/s
barely moving at
about 5000 m/s
about 5 m/s
Roughly how long does it take a photon produced in the Sun's core to reach the surface
of the Sun?
One object has a temperature twice as large as another object. If the objects have
the same surface area, how much more power does the hotter object radiate than the cooler
The greater the temperature differ
Match the quantity with their unit.
meter per second
meter per second per
A 10 kilogram shotput is held 2 meters above the ground.
A force is in the
direction of the change in
direction of motion.
direction of the velocity.
direction of the speed.
Work, in the technical sense of the word, has units of
1. Using terminology from the lecture materials, define energy. Explain the relationship between
energy and work.
Energy is the ability to do work. Let's repeat that. Energy is the ability to do work. The word
"work" is generally understood to
SES194 Home Energy Usage Worksheet
1) Of the following appliances in your house, which 5 do you think require the
most energy in a typical week? Refrigerator, Freezer, Dishwasher, Microwave,
Toaster, Oven, TV, Video Games,
Unit 7 Assignment
In a circuit, electrons carry electrical energy.
Batteries and generators create the electricity which flows in wires.
The electricity inside of wires moves at the speed of light.