What are two units of measure for the energy obtained from macronutrients?
Energy units.
A BTU (British Thermal Unit) is the amount of heat necessary to raise one pound of water by 1 degree Farenheit (F).
1 Joule (J) is the MKS unit of energy, equal to the force of one Newton acting through one meter.
1 British Thermal Unit (BTU) = 1055 J (The Mechanical Equivalent of Heat Relation)
Power = Current x Voltage (P = I V)
1 Watt is the power from a current of 1 Ampere flowing through 1 Volt.
1 kilowatt is a thousand Watts.
1 kilowatt-hour is the energy of one kilowatt power flowing for one hour. (E = P t).
1 kilowatt-hour (kwh) = 3.6 x 106 J = 3.6 million Joules
1 calorie of heat is the amount needed to raise 1 gram of water 1 degree Centigrade.
1 calorie (cal) = 4.184 J
(The Calories in food ratings are actually kilocalories.)
1 BTU = 252 cal
1 Quad = 1015 BTU (World energy usage is about 300 Quads/year, US is about 100 Quads/year in 1996.)
1 therm = 100,000 BTU
Two units of measure for the energy obtained from macronutrients are calories and joules.
1. Calorie (cal): This unit of energy is commonly used in nutrition to measure the amount of energy obtained from macronutrients. It is defined as the amount of heat required to raise the temperature of one gram of water by one degree Celsius. In terms of the larger unit, a calorie is equal to 4.184 joules.
To calculate the energy obtained from macronutrients in calories, you can refer to food labels or use databases that provide the caloric content of various foods.
2. Joule (J): This is the MKS unit of energy and is used in scientific calculations. It is defined as the amount of work done when a force of one Newton is applied over a distance of one meter. In the context of macronutrient energy, a joule is equivalent to 0.239 calories.
To convert the energy obtained from macronutrients from calories to joules, you can multiply the calorie value by 4.184.
It's important to note that when discussing energy from macronutrients, the term "calorie" used on food labels is actually a kilocalorie (kcal), which is equal to 1000 calories or 4184 joules. This is why you will often see values listed in kilocalories on food labels or in nutrition information.