Do you mean "o genki desu ka" ? If you do, it means "are you feeling healthy (good)"? I am a beginner myself and just trying to contribute.

but Denki means light, so "odenki desu ka?" means: "Is it light?" sorry for the douple posting...

Ogenki desu ka? is a set phrase that means "How are you?" But the literal word by work translation is as follows: Ogenki: the "o" is an honorary prefix. That makes the word more polite. genki means good health, good energy or something like that. Desu: desu is like the verb "to be". Ka: ka in japanese is an indicator that the sentence is a question. it is like a japanese question mark.