How Fuel cell operates?*1 pointConverts heat energy to chemical energyConverts heat energy to electrical energyConverts chemical energy to electrical energy

A fuel cell operates by converting chemical energy into electrical energy. Here's a step-by-step explanation:

1. A fuel cell consists of two electrodes: an anode and a cathode, separated by an electrolyte.

2. Hydrogen (or another fuel) is fed into the anode, and oxygen (or air) is fed into the cathode.

3. At the anode, a catalyst causes the hydrogen to split into positive hydrogen ions (protons) and negatively charged electrons.

4. The electrolyte allows only the protons to pass through to the cathode. The electrons are forced to travel through an external circuit to get to the cathode, creating an electric current.

5. At the cathode, the protons, electrons, and oxygen combine to produce water, which is the only byproduct if hydrogen is used as fuel.

6. The chemical reactions in the fuel cell continue as long as there is a supply of fuel and oxygen.

So, the correct answer to your question is "Converts chemical energy to electrical energy".