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A device that converts the energy of combustion of fuels, like hydrogen and methane, directly into electrical energy is known as:

1.	Fuel cell.	2.	Electrolytic cell.
3.	Dynamo.	4.	Ni-Cd cell.

Subtopic: Batteries & Salt Bridge |

85%

Level 1: 80%+

NEET - 2015

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The efficiency of a fuel cell is given by:

1. $\frac{∆ H}{∆ G}$

2. $\frac{∆ G}{∆ S}$

3. $\frac{∆ G}{∆ H}$

4. $\frac{∆ S}{∆ G}$

Subtopic: Batteries & Salt Bridge |

66%

Level 2: 60%+

AIPMT - 2007

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