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Pregunta	Respuesta
replacing incandescent bulbs with fluorescent bulbs are. . .	more expensive but more efficient
What is the most expensive and energy wasteful to heat your house?	electric heat
Which fossil fuel is usually the best?	natural gas
the most common nuclear power in the U.S. is. . .	Pressurized Water Reactor
In fission the neutron is. . .	slowed down. hits the nucleus and becomes a part of it. nucleus becomes unstable to spilt on its own.
In fission the neutron is. . .	slowed down. hits the nucleus and becomes a part of it. nucleus becomes unstable to spilt on its own.
a moderator for fission is. . . and what does it do?	water- it slows down the neutrons and dissipates the heat.
controlling the number of neutrons will control. . .	the reaction
control rods. . .	neutrons absorbing materials by inserting or taking out the rods.
The uranium in these nuclear power plants can not be used to make a A-bomb because. . .	it does not have a critical mass.
wanna build an A-bomb?	surround molecules with a sub-critical mass with TNT.When the explosives go off it sends these masses into the center.
steam explosion is a. . .	crack in a pipe and the hot water is released.
Chernobyl 1986	worst power plant disaster in history. began with a "safety test" which went wrong. This led to the bursting of pipes. and a steam explosion blew off the top of the reactor. took days to put the fire out. Today it is enclosed in a concrete and steel shell. still has molten and highly radioactive material inside. the final reactor was shut down in 2000. wont be safe to live by for 20,000 years.
Fukushima Daiiachi	Earthquake and tsunami. Six boiling water reactors(not PWS) of which were operating at the time. All were automatically shut down during this time(takes a long time) emergency generators powering the cooling systems were destroyed during the tsunami. All three reactors experienced a full meltdown. Hydrogen gas explosions blew apart secondary containment structures which stored spent fuel rods. will take years to recover.
explain Breeder reactors describe plutonium	turns non-fissionable U235 into plutonium, which is fissionable. Makes more plutonium than U235 is used. Very dangerous because it is less stable(easier for a meltdown) Liquid sodium is used as a coolant because there can be an explosion with a presence of oxygen. pipes and wells break more easily(must use stainless steel;difficult to weld) plutonium is radioactive, long half life, terrorists can make an A-bomb.
Passive Solar	no moving parts. building your house or trees to use the suns energy.
Active solar uses. . .	fans or pumps. the black surface absorbs sunlight to heat. glass allows the sun to come through. air or water is then heated as it passes over the tubes.
Active solar uses. . .	fans or pumps. the black surface absorbs sunlight to heat. glass allows the sun to come through. air or water is then heated as it passes over the tubes.
super insulated homes can develop indoor air pollution-what should be done?	Air exchange mechanism in a tightly sealed, energy-efficient house can prevent the buildup of toxic substances and greatly cut down on heat loss and energy use.
Solar Generated Electricity	ring of mirrors tied to a computer. Mirrors turn toward the sun and focus on the oil container to heat up to make steam to turn the turbine and poser the generator. Now they are made in a parabola so they do not need computers to shift them towards the sun.
R-value	the higher the number, the better the insulator.
U-value	measure of coating that reflects back thermal light. Lower the number the better.

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	Creado por Lauren Pardi hace más de 11 años