Z

Z (symbol) Letter symbol used to represent impedance in ohms.

zener diode (component) Normally used to regulate voltage. A p-n junction diode reverse-biased into the breakdown region; provides high impedance to applied voltages of less than breakdown magnitude. When breakdown voltage is reached, an avalanche effect causes the device to conduct - with virtually no impedance.

See also diode.

zero-suppression (computer/system) The elimination of non-significant zeros in a numeral.

zero voltage switch (circuit) A circuit designed to switch "on" at the moment the ac supply voltage crosses zero. This technique minimizes the radio frequency interference generated at switch closure.

ZIF (Zero Insertion Force) (component) A component designed to eliminate the insertion and withdrawal forces during engaging and separating.