Disadvantages of hydrogen energy?

it is very expensive compared to other forms of energy such as electricity

It takes more energy to separate the hydrogen than we can get at the end.

hydrogen is highly explosive.

The advantages of using hydrogen fuel cells are that they are an alternative fuel to fossil fuels, like coal, oil and gas. Also, burning or reacting hydrogen with oxygen runs electric motors and it's only emission is water vapour. The disadvantages of using hydrogen fuel cells is that hydrogen does not occur naturally on Earth and thus is not an energy source. It takes a great deal of energy to extract Hydrogen from water. Hope…

There are no energy sources without disadvantages.

renewable energy source non-poluting very safe and in-expensive large amounts can be stored up and used later

Hydrogen Energy is currently more expensive than any other fuel source, there is also no existing infrastructure to accommodate a Hydrogen fuel cell. The process for extracting Hydrogen to be used also usually requires the use of burning fossil fuels, thus creating pollution. Then there is the fact Hydrogen is both hard to store and distribute.

What are the advantages and disadvantages of wave energy

the energy source for hydrogen is semen ;)

Hydrogen is an element and an energy source itself.

It isn't - there are no large deposits of hydrogen anywhere. Hydrogen can be used for energy STORAGE.

Since there are no significant amounts of free hydrogen, it should be considered more of an energy storage than an energy source. In other words, it takes energy to separate water into hydrogen and oxygen; you get that energy back when the hydrogen is burned.

The products of hydrogen fusion are helium and energy.

The nuclear energy available in the hydrogen. This is a kind of potential energy. Hydrogen has a higher energy level than helium.

The disadvantages of heat are that if there is no solar energy, then there is no heat.

Hydrogen helps humans conserve energy with combustion in our bodies. Without hydrogen there is no combustion, so there is no energy.

hydrogen is a renewable energy source

This is probably assuming the hydrogen production is driven by wind energy which is renewable.

No, energy is produced by the opposite reaction, hydrogen to helium

Stars get their energy from nuclear fusion - mainly, hydrogen to helium.

requires high pressure

No similarities: - uranium: energy released by fission - hydrogen: energy released by oxidation

Hydrogen is very flammable and can easily explode. Look back the Hindenburg blimp that used hydrogen. Hydrogen burns very cleanly leaving just water vapor of a byproduct. Using Hydrogen as a fuel for cars sounds great except that you need to make it by splitting water into Hydrogen and Oxygen. That uses up as much energy as the burning of Hydrogen releases. In use as a fuel for cars, you can imagine the explosion when…

the fuel cells convert hydrogen into energy using a converter and that energy is used to power the vehicle

Potential energy is stored energy. Fossil fuels are one example of potential energy. One of the disadvantages of the potential energy in fossil fuels is that it can take tremendous amounts of kinetic energy to extract it.