The correct spelling of the word is "Tesla" /ˈtɛslə/ with the emphasis on the first syllable. The IPA phonetic transcription for this word is /ˈtɛslə/. This refers to the surname of the pioneering electrical engineer and inventor Nikola Tesla, known for his contributions to the development of the modern alternating current (AC) electrical system. Despite common misspellings such as "Tessla," the correct spelling of the name should be used in order to accurately reference the iconic inventor.