You question is a very good one, but not a very simple one to answer. IMO
I took the liberty of searching this forum using the wordage “unbalanced voltage”, a search here will give your about the same results, these are the one that I chose to present.
Most deal with the various aspects of your original OP question but get into various different levels of power starting @ 120/208V, and higher and Delta to Delta, and Delta to Wye circuits.
If you understand the basic principles of transposing power these threads will help you down the Road there are some great presentations of math and diagrams and make it easy to follow along.
The title is of the thread link to the original thread name. Most all of these threads are LOCKED…
You have to understand that the conversation my be all math but the presentation is still there.
Hope this helps !
Balanced Neutral
What is a Balanced Voltage System?
Delta to Delta transformers
Primary current calc question for unbalanced Delta / Y
Transformer Problem
single vs. 3 phase