| Most of these have existed for some time, and current is supplied through a third rail bringing direct current at about 800 Volts. |
| In contrast to direct current, polyphase AC systems proved capable of transmitting power hundreds of miles. |
| This then transforms the energy into the direct current that the battery uses to recharge. |
| Its one-directional conduction gave it the ability to convert alternating current into direct current. |
| The wind plant captures and transforms wind energy into direct current electricity. |
| The later device converts the low-voltage direct current put out by the batteries into 120-volt alternating house current. |
