The correct spelling of "am effect" should be "an effect". The reason for using "an" instead of "am" is due to the pronunciation of the word "effect". In IPA phonetic transcription, the word is pronounced as /ɪˈfɛkt/. The first sound in the word is not a vowel sound but rather a consonant sound, so using "an" instead of "am" is the correct way to simplify pronunciation. Using the correct spelling will help effective communication in written and spoken communication.