Definition
The small electrical capacitance that exists between the internal elements (such as the plates, grids, or electrodes) of a vacuum tube, transistor, or other electronic component. Although unintended, this capacitance is always present because any two conductors separated by an insulator form a capacitor, and it can affect the performance of the component at high frequencies.
Plain English
Inside electronic parts like vacuum tubes and transistors, the metal pieces sit close to each other but don't touch. That closeness creates a tiny built-in capacitor effect between them, even though no one designed it to be there. At high frequencies, that small effect starts to matter.
Context Anchor
Seen in aircraft electronics and avionics maintenance discussions, especially when explaining how radio or navigation circuits behave at high frequencies.
Derivation
From 'inter-' (Latin, meaning 'between'), 'element' (the internal parts of the component), and 'capacitance' (the ability to store electrical charge). So literally: the capacitance between the elements.
Why Pilots Care
A pilot normally does not adjust interelement capacitance directly, but it can affect how avionics circuits perform. In radios and navigation equipment, even very small unwanted capacitance can change signal behavior or make a circuit harder to tune correctly.
Analogy
Think of two metal plates held close together but not touching. Even without a labeled capacitor installed, the space between them can store a tiny charge. Interelement capacitance is that same idea happening inside an electronic part.
Intuition Check
Do not think of interelement capacitance as a separate physical capacitor that someone installed. It is usually an unavoidable electrical effect caused by nearby internal parts.
Example Sentence 1
At high frequencies, interelement capacitance inside the vacuum tube began to limit the amplifier's performance.
Example Sentence 2
High interelement capacitance in an older transmitter stage reduced overall circuit efficiency.