Common Electrical Connections in Experimental Physiology

COMMON ELECTRICAL CONNECTIONS

Galvanic current

  • Connect the simple key and the simple electrode with the battery, apply the electrode to tongue and record the effect of make current (M) Passage of current (C) and break current (B)

Faradic/induced current

  • Connect the simple key and primary coil of the induction coil in series with the low voltage terminals.
  • Connect the terminals of the secondary coil to the pair of electrodes. Move the second­ary coil away from the primary coil and turn its axis to 90 degree angle to the primary coil.
  • Apply the simple electrodes on the skin and feel the effect of make current, passage of current and break current.
  • Repeat the above procedure by decreasing the angle between the primary and secondary coils by 150 and also the distance by 1cm until the stimulus is felt on the skin. Record the results.
  • Slightly increase the current and observe the intensity of make (M) and break (B) current. Adjust for single maximal break induced current.

Introducing short circuiting key

  • In the above circuit introduce the short circuiting key between the secondary coil and the simple electrode.
  • Observe the effect of short circuiting key in on or off position during make current (M) Passage of current (C) and break current (B)

Replacement of simple key with the following instruments

  • Drum base terminals
  • Adjustable vibrating reed
  • Record your observations
Last modified: Saturday, 3 December 2011, 11:10 AM