Static electricity is frictional electricity; difficult to discharge other than all-or-nothing
Current electricity is a stream of electrons passed along a conductor. Current can be passed in a Direct Current (DC), unidirectional flow b/w anode & cathode of a battery. Current can also be passed as an Alternating Current (AC) that rhythmically flows b/w anode & cathode.
The most common form of electrotherapy is pulsed or interrupted AC.
Chemical Generation of electricity occurs in batteries by the migration of electrons through electrolyte medium from one terminal to another
Mechanical Power Generation : when electricity is passed through a wire, a magnetic field is created (electromagnetic induction). When insulated wire is moved relative to a magnet, electricity flows in wire. Electrical generators and electrical motors are conceptually based in E-M induction (how are they different?).
Electricity can help depolarize cells, causing action potentials (obey all-or-nothing law)
Real nerves are mixes of A- ά , β , γ , δ (motor & sensory), B (autonomic motor), and C (sensory) fibers; larger nerves conduct faster, more responsive, have lower thresholds, shorter durations of response, & shorter refractory periods
The more Superficial or larger the nerve, the more excitable. (A sensory > motor, & motor nerves > C sensory/pain fibers)
Frequency of steady stimulation can increase to tetany
Motor points are the locations where current elicit the greatest muscle contraction, found through trial and error (unique to each patient)