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Energy basics: units, efficiency, and the global mix — Homework
Show your multiplication or division work for every energy calculation.
- 1.An appliance uses 100 watts (0.1 kW) and runs 8 hours a day. Calculate its daily energy use in kWh.
- 2.A device converts 600 joules of input energy into 150 joules of useful output. Calculate its efficiency as a percent.
- 3.Explain, using the second law of thermodynamics, why no real device reaches 100% efficiency.
- 4.Report your home energy audit: rank the two or three appliances you measured from highest to lowest daily kWh use.
🌲 Homeschool of the FutureTwelfth Grade · Science · week 28 homework