Answer
Primary and secondary active transport processes are different in that primary active transport relies on the energy provided by ATP to complete its process, which secondary active transport relies on the energy provided by an electrochemical gradient, created by the transport of ions in and out of a cell along this gradient.
Work Step by Step
ATP stores energy between its phosphate bonds, which when attached to a transmembrane protein is enough to complete the transport of materials against a gradient (primary active transport). In an electrochemical gradient, the exiting of ions out of a cell along the gradient creates enough energy to transport materials or more ions into the cell against the gradient (secondary active transport).
