Q:Hydrogen isn't actually an energy source -- it's an energy carrier [source: CECA]. Hydrogen carries the energy that's created when it's produced. It's similar to electricity: We can't burn electricity (which is an energy carrier), but electricity can be produced by burning energy sources like natural gas or petroleum. Then electricity transports this energy to other places, like the outlets in your home.

Hydrogen cars have many problems. Where to get the hydrogen in the first place, how to transport and store it, how to make fuel cells (which currently use platinum) affordable, etc. I wrote a wiki article on the subject linked below.

Q:I need to do an oral presentation at school howver I only seem to come across with websites explainig topics about chemestry processes that occur in fuel cells. What I really need is something about physics

Fuel cells cannot be designed by chemistry alone, there are many factors in which physics must play a role, such as properties of charged particles, current transfer, fluids, diffusion, mass transfer, heat transfer, thermoelastic stress, involving thermodynamics, electrochemistry, fluid dynamics, membrane physics, even mechanics of stress. For example, how do things flow through a membrane with a certain size of porosity and structure? Especially when we mix charged ions in the fluids, which may be subject to electric fields? That's a complicated problem of physics, not chemistry. The concept of fuel cells is easy to explain chemically but very hard to design an efficient one without using physics. Here's a link to a real company developing real fuel cells, you'll see what I mean:

Q:does anyone know the average internal resistance of an alkaline fuel cell. Thanks for answering ;))

Cannot determine without first knowing the wattage of fuel cell. Use this formula to calculate a single fuel cell: I w / 0.75 R 0.75 / I

Q:Every hydrogen fuel cell currently in production or concept uses some form of fossil fuel to generate the hydrogen gas. Are we really saving anything here or are we just covering one problem up with another?

We might conserve a wee bit if they can really get the ball rolling and they fully develop the system. BUT~ How long is it going to take and how expensive will they be upon initial mass production. I think the price will be high and the benefits low at the onset. BMW is working on it and my chances of getting one is slim to nothing. I have too many kids so that one went out the window. If they ever get it down to a virtual science and 3-4 years of mass production would be enough for Ford or whoever to come along with something efficient and less bucks. Another caveat: I hope the things are well made. If not, the death toll will rise and they will yank it off the market due to individual and class action lawsuits.

Q:A) hydropowerB) biomassC) fuel cellsD) photovoltaic cellsE) OTEC

fuel cells they burn H2 gas using O2 gas so you get H2O and energy. Hydropower powerplant at waterfall or river using power of the waterflow Biomass using biological material as fuel Photovoltaic cells solar power OTEC using oceanic termal energy

Q:i dont like the smaller fuel cells that nascar uses at some tracks. i go to and watch races to watch the cars race each other, not to see the race turn into the fastest pit stops, i want to see more racing on the track, also if nascar is so worried about the people that race, or pit WHY HAVE MORE PIT STOPS, someday some pit crew member is going to get hurt bad or maybe God forbid something worst, because they had to make 2 or 3 more pit stops than they would have had they a bigger fuel cell, what will nascar do then, ok on lap 40 all the even number cars will pit, and on lap 41 all the odd number cars will pit, Will they say sorry we didnt think that would happen., dont think so

Well it don't work, and I can PROVE IT. AAA tested it and it don't work, but you don't want to hear that so. They way they get the better fuel mileage is to lean out the fuel air mix, to the point where it will damage your valves or pistons. As a mechanic you should know what that will do to an engine. So you save a few dollars on fuel but get the fun of rebuilding an engine. As far as flash back use what they use on torches, you can get them at most auto supply shops. BTW if you are ASE certified for engines you should already know what it's going to do to sensors/computer. Your sensors are going to see low oxygen levels in your exhaust your computer will lean out the fuel to bring the oxygen levels to normal, if it can't do that it will go into default mode and turn on the CEL. While in default mode it will burn more fuel, you will lose power so now you have a car that will not pass the emission test, in most states if the CEL is on you fail no matter what, and it runs worse and uses more fuel. EDIT If this worked as claimed why don't we see them on RACE cars. Think about it to get X% more fuel mileage they would have to increase the output of the engine by X%. So for a hundred dollars or so I'd get big boost in HP. I say race cars now because so many people believe that the auto companies are in bed with big oil. While people who are out to increase the speed and power of their cars clearly are not. Do you think that if a simple device like this would do as it's claimed every street rod in the world would have one. Don't let logic stand in the way of a good con.

Q:also are there limitations to this resource??answer if u any of these 2 questionsthanks!!

Hydrogen is the simplest most abundant element in nature. It exists as a hydrogen molecule H2 gas under standard conditions. A fuel cell is a device that uses hydrogen as a fuel to generate electricity. There are many ways to generate hydrogen gas. The most used method currently is to use natural gas CH4(Methane) to generate hydrogen molecules. Electrolysis of water is also popular but it uses a lot of electricity. Using sewage to generate hydrogen is also being used similar to the natural gas process. There are other ways as well but these are the most widespread currently. Hydrogen as a resource is basically inexhaustible. The challenge is to generate it while producing few harmful emissions i.e. using renewable energy.

Q:and tell me whycuz me and my bro have been arguing over it

Depends what you're comparing it to. They are better for the environment than gas cars, but worse than electric cars. But most importantly, they're completely impractical. Honda is hoping to get the cost of their fuel cell car down below $100k in the next decade. Yes that's right

Q:also which can be produced in the most eco friendly way?im referring to their use in cars.

An electric car will always be cheaper to buy and operate than a fuel cell car. I believe my explanation below will make this obvious. * A fuel cell car IS an electric car - it even has batteries, because the fuel cell can't output enough

Q:I hope is not more than 1/4 of the price of unleaded gasoline.

don know but ask 50 cent.