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.
A heating current is passed through to a filament that causes it to emit electrons. These are accelerated from the filament to the anode by applying a high negative voltage to the filament. A control electrode, or grid, is situated close to the filament and is held at a negative potential in respect to it.