Fact 1: Microbial fuel cells convert chemical energy into electrical energy.

Fact 2: Power involves electrical energy.

Given the two facts above, answer the question "Microbial fuel cells convert chemical energy into what?" with the following options: 
- water energy
 - power
 - turbine energy
 - LEDs
 - solar energy
 - Light
 - Heat
 - gas


 

  power       