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Galvanic currents

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Galvanic currents

  1. 1. Galvanic CurrentsGalvanic Currents Dr.Deepak Anap,Asso. Professor COPT,PDVVPF deepak.anap@hotmail.com Galvanic Currents - Dr.Deepak
  2. 2. Objectives • History • Introduction to DC • Graphical Representation • Interrupted DC • Wave form Characteristics – Duration and Frequency • IDC Waveforms Galvanic Currents - Dr.Deepak
  3. 3. History • Luigi Galvani ,an Italian Physiologist-on whose honor galvanic current is named. • First to show that when electric current is passed through the legs of a frog, it twitched, way back in 1791. Galvanic Currents - Dr.Deepak
  4. 4. Galvanic Currents - Dr.Deepak
  5. 5. Definition • In DC, electrical current flows in one constant direction, as opposed to AC, in which the current constantly reverses direction. • Ex of a device that provides DC : battery. • DC ultimately supplies power to nearly all electronic devices (even if these devices require a component to convert AC current into DC current). Galvanic Currents - Dr.Deepak
  6. 6. DC Vs AC Galvanic Currents - Dr.Deepak
  7. 7. Galvanic Currents - Dr.Deepak
  8. 8. Modifications of DC • Interruption – most usual modification of DC • Interrupted DC • Current flow commencing & ceasing at regular intervals Galvanic Currents - Dr.Deepak
  9. 9. Wave form Characteristics • Duration • Duration 100,300,600ms used for Treatment with IDC Galvanic Currents - Dr.Deepak Duration
  10. 10. • Frequency: No. of impulses/Sec • Depends on duration of Interval between the impulses • Duration α 1/Frequency Galvanic Currents - Dr.Deepak Duration of interval
  11. 11. Galvanic Currents - Dr.Deepak
  12. 12. IDC waveforms Galvanic Currents - Dr.Deepak DC Rectangular IDC Current rises suddenly, constantly maintained for the duration of the stimulus then turned off abruptly
  13. 13. Triangular Pulses • Traingular: has an equal phase of slow rise and then slow falling off in intensity Galvanic Currents - Dr.Deepak
  14. 14. Trapezoidal Pulses Current rises slowly, plateaus for a short period then gradually declines Galvanic Currents - Dr.Deepak
  15. 15. Saw Tooth Pulses current is gradually raised then turned off abruptly Galvanic Currents - Dr.Deepak
  16. 16. Depolarised Wave Form • Current of low intensity flows in reverse direction • Chemical formation because of DC is reduced Galvanic Currents - Dr.Deepak
  17. 17. Thank you

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