Lighthouse cubes united one wire. Serial and parallel connections in electrical engineering are two main ways of connecting elements of an electrical circuit. When connected in series, all the elements are connected to each other so that the part of the chain that includes them does not have a single node. In a parallel connection, all the elements in the chain are combined by two nodes and have no links with other nodes, if this does not contradict the condition. When connecting conductors in series, the current in all conductors is the same. In this case, the total voltage in the circuit is the sum of the voltages at the ends of each of the conductors.