Biofeedback is a natural method that has been found to be helpful for many persons with migraine headaches, ADHD, epilepsy, stroke, anxiety, addictions, asthma, depression, hypertension, muscle spasms, sleep disturbance, chronic pain, stomach pain, stress, and other symptoms and conditions for both children and adults.
If the electric circuit is purely resistive, that is, a configuration of resistors only connected to a battery; the source energy continually gets dissipated entirely in the form of heat. This is known as the heating effect of electric current.
Heating is the main biological effect of the electromagnetic fields of radiofrequency fields. In microwave ovens this fact is employed to warm up food. The levels of radiofrequency fields to which people are normally exposed are very much lower than those needed to produce significant heating.