Answer:
A) (i) 4*10^12 Ibs , (ii) 600 * 10^9 Ibs
(iii)
- Wind energy is a clean energy : this is because there is no consumption of fossil fuels when using wind energy to generate electricity
- Wind energy is a renewable energy : wind is reusable and it is always available for use
B) The use of bricks or stone that can absorb the solar heat easily when the sun rays heat them up and this solar heat absorbed . is a typical example of a passive solar heating system.
C) Advantage : It is mostly cost free
disadvantage : there is no storage mechanism
Explanation:
A) Given that U.S uses roughly 4 million Gigawatt-hours per year in electricity and 50% of the electricity comes from coal
<u>i) Determine how much carbon dioxide is released from burning coal each year </u>
since 50% of electricity comes from coal
The Total energy produced by coal =2*10^12 Kw-h. also
1.0 kilowatt-hour of coal burned releases 2 lbs.
hence the Total amount of Carbon dioxide released from burning coal each year = 2 * 2 * 10^12 = 4 * 10^12 Ibs
<u>ii) Determine the reduction of carbon dioxide entering the atmosphere each year if coal usage could be reduced by 15% by utilizing solar energy</u>
= 15% 0f 4*10^12
reduction of coal usage by 15% = 600 * 10^9 Ibs hence the amount of coal entering the atmosphere is reduced by 600 * 10^9 Ibs
iii) Advantages of using wind energy to generate electricity
- Wind energy is a clean energy : this is because there is no consumption of fossil fuels when using wind energy to generate electricity
- Wind energy is a renewable energy : wind is reusable and it is always available for use
B) Passive solar heating system
The use of bricks or stone that can absorb the solar heat easily when the sun rays heat them up and this solar heat absorbed . is a typical example of a passive solar heating system.
C) advantage and disadvantage of solar heating system
Advantage : It is mostly cost free
disadvantage : there is no storage mechanism
