# biology

posted by
**Kathlene** on
.

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