Glossary of Terms - W


The measure of real power. It is the power expended when on ampere of direct current flows through a resistance of one ohm. WATTS = EI x PF

Wheatstone Bridge

A full resistance two-wire bridge with RTD, power source, zero and sensitivity adjustments balanced at some reference temperature. Heating or cooling causes a resistance change and discrete circuit unbalance, which indicates the temperature. Various RTD bridge network connections use 2-, 3-, or 4-wire hook-up arrangements, depending on the accuracy required in the temperature measurement. These are designed to balance out lead wire resistance between the sensor and the bridge.

WYE Connection

A connection of three components made in such a manner that one end of each component is connected; generally used to connect devices to a three-phase power system.