Abstract: A homopolar machine for producing high voltage, direct current. The machine comprises a stator which supports the homopolar machine, a plurality of excitation coils disposed within the stator for producing magnetic flux so that the homopolar machine can produce direct current when in operation, a rotor rotationally disposed within the excitation coils for rotating through the magnetic flux when the homopolar machine is in operation to produce direct current, and a coil of a single length continuous conductor element disposed about the rotor such that a plurality of rotor conductor segments are formed wherein successive ones of the plurality of conductor segments are electrically connected such that an induced voltage and direct current are produced in the coil when the rotor and coil traverse through the magnetic flux during homopolar machine operation. Homopolar machines described herein are useful in a wide range of applications, operate with high voltages and allow straight transformation of a DC voltage.