Electronics and brain research were born at the same time, developed together and fertilized each other. Sometimes, the too-tight parallels led to discrepancies, from assuming the same charge carrier and transfer mechanism for conductors and biological structures to using equivalent circuits for biological neurons, or misunderstanding the essence of spiking for electronically implemented circuits. Those wrong parallels hide the need for introducing thermoelectricity with its mixing speeds instead of separated electrical and diffusional processes, that life is governed by finite-speed (”slow”) currents and that finite-size (distributed) biological objects, cannot be directly and accurately mapped to point-like (ideal) electrical components. We must connect the discrete electricity to the continuous one; furthermore, in biology, concentration changes evoke potential changes and create large potential gradients (and vice versa). Those internal gradients start dynamical electrical ion currents in biological tissues.