An adapter assembly for selectively interconnecting a surgical loading unit that is configured to perform a function and a surgical device that is configured to actuate the loading unit, the loading unit including at least one axially translatable drive member (366, 374), and the surgical device including at least one rotatable drive shaft, the adapter assembly comprising: a housing configured and adapted for connection with the surgical device and to be in operative communication with each rotatable drive shaft of the surgical device; an outer tube having a proximal end supported by the housing and a distal end configured and adapted for connection with the loading unit, wherein the distal end of the outer tube is in operative communication with each of the at least one axially translatable drive member of the loading unit; at least one force/rotation transmitting/converting assembly (240, 250) for interconnecting a respective one drive shaft (118, 120) of the surgical device and a respective one axially translatable drive member (366, 37 4) of the loading unit; and an electrical assembly supported within at least one of the housing and the outer tube thereof, the electrical assembly including: a circuit board; at least one contact pin electrically connected to the circuit board and being configured and adapted to selectively electrically connect to a complementary electrical plug of the surgical device; a strain gauge supported and electrically connected to the circuit board, wherein a first rotatable proximal drive shaft extends through the strain gauge; and a slip ring disposed about at least a portion of a first force/rotation transmitting/converting assembly of the at least one force/rotation transmitting/converting assembly, wherein the slip ring is in electrical connection with the circuit board, and wherein the slip ring includes electrical contact supported therein for maintaining electrical contact with at least one electrical component within the adapter assembly. a housing configured and adapted for connection with the surgical device and to be in operative communication with each rotatable drive shaft of the surgical device; an outer tube having a proximal end supported by the housing and a distal end configured and adapted for connection with the loading unit, wherein the distal end of the outer tube is in operative communication with each of the at least one axially translatable drive member of the loading unit; at least one force/rotation transmitting/converting assembly (240, 250) for interconnecting a respective one drive shaft (118, 120) of the surgical device and a respective one axially translatable drive member (366, 37 4) of the loading unit; and an electrical assembly supported within at least one of the housing and the outer tube thereof, the electrical assembly including: a circuit board; at least one contact pin electrically connected to the circuit board and being configured and adapted to selectively electrically connect to a complementary electrical plug of the surgical device; a strain gauge supported and electrically connected to the circuit board, wherein a first rotatable proximal drive shaft extends through the strain gauge; and a slip ring disposed about at least a portion of a first force/rotation transmitting/converting assembly of the at least one force/rotation transmitting/converting assembly, wherein the slip ring is in electrical connection with the circuit board, and wherein the slip ring includes electrical contact supported therein for maintaining electrical contact with at least one electrical component within the adapter assembly. a circuit board; at least one contact pin electrically connected to the circuit board and being configured and adapted to selectively electrically connect to a complementary electrical plug of the surgical device; a strain gauge supported and electrically connected to the circuit board, wherein a first rotatable proximal drive shaft extends through the strain gauge; and a slip ring disposed about at least a portion of a first force/rotation transmitting/converting assembly of the at least one force/rotation transmitting/converting assembly, wherein the slip ring is in electrical connection with the circuit board, and wherein the slip ring includes electrical contact supported therein for maintaining electrical contact with at least one electrical component within the adapter assembly.