So less diffusion of oxygen into the blood Why is the volume of oxygen that has to be absorbed and the volume of CO2 that has to be removed large in mammals? (2)
A kilowatt-hour is the electrical energy consumed in one hour at the constant rate of one kilowatt. The average household in the United States uses about 8,900 kilowatt-hours of electricity each year.. Power is defined as the rate at which work is done or energy is consumed.
Best Answer: The average household in America consumes about 14,000 kilowatt-hours (kWh) per year, according to the Department of Energy.eport Abuse. The average household in the United States uses about 8,900 kilowatt-hours of electricity each year.. there are 9000 hours in a year. so 9e3 kwatt-hour/9e3 = about 1kw average usage, averaged over time, is 1000 watts.