§1-3 Kirchhoffs laws A point at which two or more elements have common connection is called a node(节点). Suppose that we start at one node in a network and move through a simple element to the node at the other.., if no node was encountered more than once, then the set of nodes and elements that we have passed hrough is defined as a pati(路径).§1-3 Kirchhoff' s laws A point at which two or more elements have common connection is called a node(节点). Suppose that we start at one node in a network and move through a simple element to the node at the other…, if no node was encountered more than once, then the set of nodes and elements that we have passed through is defined as a path（路径）. 1 2 3 3 1 2 a b