Question

A fuel cell uses oxygen and gas as fuel.

Answer 1

A fuel cell is a device that converts chemical energy (energy released during chemical reactions) into electrical energy.

In a fuel cell, hydrogen gas reacts with oxygen to produce huge amount of energy and water is formed as a byproduct. The reaction involved is:

${\text{2H}}_2\text{(g)}+{\text{O}}_2\text{(aq)}\to {\text{H}}_2\text{O}\text{(l)}+\text{Energy}$