I am new hear. I have a BS in mathematics that I earned many many years ago. I tutor mathematics and also work with small groups of homeschoolers. I am trying to teach myself about using Arduino so I can introduce it to students. I thought I knew much more about electronics and electricity than I actually do. The depth of my ignorance is becoming more and more apparent to me. Fortunately I discovered this forum, and I hope that I can contribute something to others as I learn.