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 |
 83%
From NCERT
NEET - 2015
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The efficiency of a fuel cell is given by:

1. HG

2. GS

3. GH

4. SG

Subtopic:  Batteries & Salt Bridge |
 65%
AIPMT - 2007
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