Give an example of fuel cell.

Explanation

**Step-by-Step Solution:**

1. **Definition of a Fuel Cell**: A fuel cell is a type of electrochemical cell that converts the chemical energy of a fuel directly into electrical energy through a chemical reaction. Unlike batteries, fuel cells can continuously produce electricity as long as fuel is supplied.

2. **Components of a Fuel Cell**: The basic components of a fuel cell include an anode, a cathode, and an electrolyte. In a hydrogen-oxygen fuel cell, hydrogen gas is supplied to the anode and oxygen gas is supplied to the cathode.

3. **Example of a Fuel Cell**: A common example of a fuel cell is the hydrogen-oxygen fuel cell. In this type of fuel cell, hydrogen (H2) is oxidized at the anode, and oxygen (O2) is reduced at the cathode.

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