The electrics used 112 volt direct current generators, one on each engine, for functions requiring large amounts of electrical power. A 28 V DC system was used for other systems including actuators that initiated the higher-voltage system functions. Backup batteries were a bank of 24 V units and 96 V batteries. 115 V alternating current was provided to systems such as radar; the actuators for the flight surfaces, flaps, air brakes and undercarriage. It was decided during development that as much of the aircraft would be electrically driven as was possible; this design choice was due to electrical cabling being lighter than its hydraulic equivalent, and the electrical generators needed for the radar.