A device that convers energy of combustion of fueles like hydrogen and methane, directly into electrical energy is known as .

Options

A. fuel cell
B. electrolytic cell
C. dynamo
D. Ni-Cd cell

Explanation

To answer the question about the device that converts the energy of combustion of fuels like hydrogen and methane directly into electrical energy, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for a device that converts the energy from the combustion of fuels directly into electrical energy.

2. **Identifying the Device**: The device that performs this function is known as a **fuel cell**.

3. **Function of a Fuel Cell**: A fuel cell works by using hydrogen (or other fuels) and oxygen to produce electricity. In a typical hydrogen fuel cell, hydrogen gas reacts with oxygen gas to produce water and electrical energy.

4. **Chemical Reaction**: The chemical reaction that occurs in a hydrogen fuel cell can be represented as:
\[ 2H_2 + O_2 \rightarrow 2H_2O + \text{Electrical Energy} \]
Here, hydrogen (H2) and oxygen (O2) combine to form water (H2O), and in the process, electrical energy is produced.

5. **Advantages of Fuel Cells**: Fuel cells are considered effective and eco-friendly because they produce water as a byproduct and do not emit harmful gases, making them a clean energy source.

### Final Answer:
The device that converts the energy of combustion of fuels like hydrogen and methane directly into electrical energy is known as a **fuel cell**.

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