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Mir space station cosmonauts, 1987Mir space station cosmonauts. Soviet cosmonauts Yuri Romanenko and Aleksandr Laveykin assembling an electrical power pack on the Mir space station, in 1987
Power supply experiment. Power pack (left) and oscilloscope (right) being used in an experiment to demonstrate rectification
AC and DC power supplies displayed on the screen of an oscilloscope (centre). Direct current (DC, the straight line) is produced by the equipment at left, while alternating current (AC)
Electric batteries, 19th centuryElectric batteries. Two early electric batteries connected in series to form a battery pack used to provide electrical power. The first battery was developed by Volta in 1800