vetojännitteen

Veto jännitteen, often translated as "pull voltage" or "bias voltage," is a concept primarily found in the context of vacuum tubes and older electronic components. It refers to a voltage applied to a specific electrode within a device to control the flow of electrons or other charged particles. In the case of a vacuum tube, this often relates to the grid, which acts like a control valve for the electron stream flowing from the cathode to the anode.

The purpose of veto jännitteen is to influence the conductivity of the device. By applying a negative voltage to the grid, for example, it repels electrons and reduces or completely stops the current flow to the anode. Conversely, a less negative or even positive grid voltage allows more electrons to pass, increasing the current. This control mechanism is fundamental to the amplification and switching capabilities of vacuum tubes.

While the term veto jännitteen is less common in modern solid-state electronics, the underlying principle of using an applied voltage to control current flow is ubiquitous. For instance, in a transistor, the gate voltage (in MOSFETs) or base current (in BJTs) serves a similar controlling function. Understanding veto jännitteen provides insight into the historical development of electronics and the fundamental physics governing charge transport in active components.