Sunday
April 20, 2014

Homework Help: biology

Posted by Kathlene on Saturday, February 3, 2007 at 12:03am.

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

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

chemistry - The use of the British thermal unit (Btu {\rm Btu}) is common in ...
Chemistry - Consider a system of three molecules A, B, and C. Suppose that three...
Probability - Consider a system of three molecules A, B, and C. Suppose that ...
CHEMISTRY - Consider a system of three molecules A, B, and C. Suppose that three...
Chem - Consider a system of three molecules A, B, and C. Suppose that three ...
chem helpp! - Consider a system of three molecules A, B, and C. Suppose that ...
Chemistry - An office heater puts out 2070 Btus (British thermal units) of ...
Chemistry - An office heater puts out 2070 Btus (British thermal units) of ...
CHEM. help please - Consider a system of 3 molecules, A, B, and C. Suppose the 3...
Chem Help please - Consider a system of 3 molecules, A, B, and C. Suppose the 3 ...

Search
Members