41. They require alternating currents to operate properly and will not function on direct current . 42. Direct current is used to charge batteries and as power supply for electronic systems.43. The 12-volt direct current outlets are compatible with the universal cigarette-lighter adapter in automobiles. 44. The majority of onboard electronics operated on direct current . 45. The etching power is a source of direct current . 46. Edison, an advocate of direct current , was competing with George Westinghouse, who favored alternating current. 47. The big debate was over alternating versus direct current , the Mac-versus-PC fight of that era. 48. Set the meter to the 2 . 5 VDC ( direct current voltage ) scale. 49. It also prevents low direct current voltages from passing. 50. There are some places with High-voltage direct current distribution.
