To find plausible explanations of generation of the nerve impulses and the measured brain waves, we modified in this study the volume conduction (VC) model by introducing a new definition of the flowing nerve impulses as electric charges. Such definition depends on a neuroscientific description of the flow of nerve impulses as electric signals. Recognizing a transmembrane Seebeck effect in the neurons, we found this effect can convert the thermal potential of the metabolic heat inside the neuron into an electric potential of the energy that crosses the neuron's membrane by its thermal potential. Such conversion initiates a series of thermos-electrochemical processes, as in thermocells, that leads to generation of nerve impulses as electric charges. According to an innovative definition of the electric charges as electromagnetic (EM) waves that have an electric potential, it was possible to define the brain waves, or the electroencephalogram (EEG), as diffusion of the generated nerve impulses, or electric charges. Accordingly, the measured transmembrane potential is due to accumulations of the electric potentials of the generated electric charges. We also explain that the measured high consumption of metabolic heat in the brain is due to its conversion into electric energy by its neurons. The Ammeter's readings have the flow unit “Watt/Volt." Accordingly, the neuron's power is directly determined as the product of the measured membrane's potential times the Ammeter's measurements of the flow through the neuron's axon. According to this study, the Ammeter' reading measures a neurodiagnostic property of the neural conductors that determines the conductor's capacity to allow flow of electric power by a unit electric potential.