### Question
What is the definition of fuel cell?


### Answer
The definition of **fuel cell** is as follows in *42 U.S.C. § 16152*:

> a device that directly converts the chemical energy of a fuel, which is supplied from an external source, and an oxidant into electricity by electrochemical processes occurring at separate electrodes in the device

#### Citation:
  - *42 U.S.C. § 16152*
  - Heading: **CHAPTER 149-NATIONAL ENERGY POLICY AND PROGRAMS > SUBCHAPTER VIII-HYDROGEN**

