low-voltage vs low-tension

low-voltage and low-tension both are adjectives.

Word	Noun	Adjective	Verb	Adverb
low-voltage	No	Yes	No	No
low-tension	No	Yes	No	No

As adjectives, low-voltage and low-tension are synonyms defined as:

low-voltage and low-tension: subjected to or capable of operating under relative low voltage

low-voltage (adjective)	low-tension (adjective)
subjected to or capable of operating under relative low voltage	subjected to or capable of operating under relative low voltage