Cause: electron moves through electron transport chain. effect?

Electrons move through the electron transport chain from a higher to lower energy state. Energy release moves protons through channels in the membrane proteins, moving them into the inner membrane space. This leads to a buildup of positively charged protons, which creates an electrical potential across the membrane.
- https://www.google.com/amp/s/www.news-medical.net/amp/life-sciences/What-is-the-Electron-Transport-Chain.aspx

Cotton was the very first