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