Chapter 1 Energy And Power Flashcards
What is power?
Power is the rate at which energy is released or consumed
How is energy released or used?
Energy is released due to work or used to do work.
1 calorie = ??
~ 4 Joules
1 food calorie equals how many regular calories?
1000 calories
Heating up a cup of tap water requires how much energy?
1,200,000 joules, 300,000 calories or 300 Calories
What is a kilowatt hour?
Measure of electrical energy 1000watts for 1 hour
1 Meter per second = ??
2 miles per hour
1 kilogram of mass equals how many pounds of weight on Earth?
2 pounds
Kinetic energy is…
Energy a body possesses by virtue of being in motion
Potential energy is…
Stored energy of position possessed by an object
Kinetic energy can be measured in…
Calories
What is the main reason that hydrogen driven automobiles have not replaced gasoline ones
Hydrogen is too difficult to store in an automobile
Compared to an equal weight of gasoline u-235 can deliver energy that is greater by a factor of?
One million
Out of coal, gasoline, natural gas, and aaa batteries which is least expensive for the same energy delivered?
Coal
A limitation for all electric automobiles is
Low energy density per battery
