Home > Shedding Light on Energy: Episode 2—Measuring Energy
Energy is necessary to make things happen and can be measured in joules. See a review of energy forms and transformations.
It takes 4,200 joules to heat one kilogram of water by 1 degree Celsius. Energy is often quoted in kilojoules. Learn about joules needed to heat different amounts of water and view the energy equation.
Learn about energy intake and expenditure. Sitting takes about 100 joules per second and 6 kilojoules per minute; the brain, heart, digestion and body temperature regulation use energy.
We need 8,000-10,000 kJ per day; fats contain 37 kJ/gram and carbohydrates contain 17 kJ/gram. Learn about metabolism in different species. View energy content for different foods in kJ/100 gram; a bomb calorimeter measures energy.
View an example of energy expenditure in car engines and learn about cellular respiration in humans. View examples of foods producing 8,500 kJ per day; experts discuss weight. Losing weight requires expanding more energy and changing diet to maintain satiety.
Credits: Shedding Light on Energy: Episode 2—Measuring Energy
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In this program, we introduce the “joule”, the unit for energy. We then look at how much energy is stored in different foods by comparing apples and oranges (normally a no-no) and we discuss how much energy we need to do certain things including nothing much at all. We then explore the concept of energy balance and reveal the two simple rules for weight loss. That’s right, there are only two!
Length: 35 minutes
Copyright date: ©2018
Prices include public performance rights.
Not available to Home Video customers.
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