first cause, prime mover, primum mobile - an agent that is the cause of all things but does not itself have a cause; God is the first cause destiny, fate - the ultimate agency regarded as predetermining the course of events (often personified as a woman); we are helpless in the face of destiny
Which Side of a Battery is Positive? A cell or battery is drawn with a long line and a shorter line. The long line is the positive side (plus is longer). The short line is the negative side (minus is shorter).
In this case, the wires served as the battery's positive electrode, or cathode, and the researchers used lithium on the other side of the film as the anode. The purpose of an electrode is to transmit the electrical charges and to erode the workpiece to a desired shape.