Select the correct answer from each drop-down menu . a hydrogen fuel cell is more efficient than a combustion reaction because very little of the released energy is when used at home, a fuel cell eliminates the need for thr cell is portable heat electrical energy chemical energy oxygen hydrogen an electrical grid

Heat

Electrical grid

Explanation:

A hydrogen fuel cell works by converting the chemical energy of hydrogen and oxygen to electricity with the means of redox reactions reactions. It has an efficiency in the range of 40–60%. This means only 60-30% of the energy is lost as waste heat.

The mechanism of with which the fuel cell works does not require electricity so an electrical grid would not be required.

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at right angles to each other