Electrical Stimulation

Electrical current causes a muscle or a muscle group to contract. Contracting the muscle helps strengthen the affected muscle. Along with increasing muscle strength, the electrical current stimulation and the contraction of the muscle promotes blood supply to the area which ultimately assists in healing 
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​Treats:  osteoarthritis, fibromyalgia, back pain, muscle strains, ligament sprains, neck pain, tendinitis,  bursitis

Different Types of Electrical Stimulations

Transcutaneous Electrical Neuromuscular Stimulation (TENS)

Applies electrodes to body over painful areas. The intensity of electricity is adjusted to block pain signals 

Iontophoresis

Along with electrical stimulation, there is also the administration of medication to decrease inflammation. Drugs can also be used to break up calcium deposits

Neuromuscular Electrical Stimulation (NMES)

Causes single muscle/group to contract. It recruits other muscle fibers to react as a result. 

http://www.learningelectronics.net

Electric Current

At least two pads are connected by wires to each channel. The user gets to control the intensity of the electrical current to each pair of pads. 

The circuit inside a TENS machine can be programmable to generate pulses. These pulses can vary with current strength, pulse rate and pulse widths. 

The current intensity 0 - 80 mA, with some machines allowing up to 100mA. A conventional TENS uses a frequency of 40-150Hz with a pulses during of 50 microseconds at maximum.

Battery = source of potential difference

Current = motion of charges sustained by an electric field

http://www.hands-onpt.com

https://naturesgatetens.com