Question

What is the name of a system that converts thermal energy into a form of useful mechanical or electrical energy?
incubator
heat engine
centrifuge
vacuum column
spectrophotometer

Answer 1

Have you tried looking those thing up on Wikipedia? That will help, I'm positive. Once you look up the answer on Wikipedia, you'll know. It's the definition.

Before that, you might be able to eliminate some options so that you have less to look up! Of course, if you don't find the answer in Wikipedia, you might want tor check the options you eliminated.

Answer 2

I agree with @theEric. Once you know what each item is, it should be obvious which is the correct answer.

Answer 3

It is a heat engine.

Answer 4

Yep! :)