Power Concept Notes
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Power Concept Notes Unit 7 (Energy)
Introduction Questions: World’s Strongest Man: Atlas Stones Event - lifting 5 massive stones and placing them on 5 platforms above the ground, often of varying height.
Questions Your Initial Thoughts... Class Consensus... 1. Throughout the challenge each man loses energy. Where is this energy stored in the end?
2. Does one man lose more energy than the other during the competition? Why?
3. How is the winner (the strongest and most powerful man) determined?
Strength or POWER is measured by...
A.
B.
Power Equation and Units →
Page 1 Guiding Questions : ¨What questions do you need answered before coming up with an accurate proposal for an Off-the-Grid day activity?
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Off-the-Grid Activity Constraints :
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Off-the-Grid Activity Brainstorming:
Classroom Activity Ideas What materials / devices are needed for this activity? Who can bring these?
Example Electrical Power Problems :
Page 2 A school in Indiana needed to save money due to budget cuts. Among other things, the district decided to shut off half of the school hallway lights during the school day in an effort to cut down electricity costs. Were the dark hallways worth the savings? Lets find out...
1. If you left a 23W light bulb on during the entire school year (180, 8hr days) how much energy would it use?
2. How much does the school save by shutting off half the hallway lights? (# of bulbs = 736) Energy from the electric company costs $0.09 for each “kilowatt·hour” of electrical energy used.
Bicycle Generator Example Problem:
3. How long would you have to ride the bike generator to provide enough energy to power 1 of the 23W bulbs for just one class period (50 min)?
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