Some Simscape™ Electrical™ blocks have an option to switch certain ports between physical signal and electrical conserving ports. An electrical conserving port is a Simscape physical conserving port that has a Through variable of current and an Across variable of voltage. For a comparison of Simscape physical signal and physical conserving ports, see Connector Ports and Connection Lines.
To switch a block connection port between an electrical conserving port and a physical signal port :
Right-click the block.
On the Simscape > Block choices context menu, select a variant that includes the term Electrical, for an electrical conserving port, or PS for a physical signal port.