Tenney also states the following:
The most distinctive name by which God was known in Israel is Yahweh (Jehovah), which comes from the same root as “I AM”…(238)
“I Am’s” significant meaning here in Exodus is that Moses credentials for being the one to lead Egypt out of bondage are found in him using the name “I AM.” He is the One giving permission to Moses to use His name to deliver the Israelites. This will be done by God’s mighty power which will work through Moses.