The voltage drop around a circuit including wiring and loads must equal the supply voltage.

Related Terms


A device for producing a deliberate pressure drop or resistance in a line by reducing the cross-sectional flow area.


The amount of contaminants a filter will hold before an excessive pressure drop is caused. Some filters have bypass valves which open when a filter reaches its rated capacity.


The apparent voltage, as measured by the drop in pressure due to a current flowing through a resistance. (EMF)


A method which involves placing a drop of fluid on a permeable piece of paper and noting the development and nature of the halos, or rings, surrounding the drop through time. The roots of this test can be traced to the 1940s, when railroads used the 'blotter spot' tests.


A reaction turbine utilizes a jet of steam that flows from a nozzle on the rotor. Actually, the steam is directed into the moving blades by fixed blades designed to expand the steam. The result is a small increase in velocity over that of the moving blades. These blades form a wall of moving nozzles that further expand the steam. The steam flow is partially reversed by the moving blades, producing a reaction on the blades. Since the pressure drop is small across each row of nozzles (blades), the speed is comparatively low. Therefore, more rows of moving blades are needed than in an impulse turbine.


The process whereby a drop in pressure or increase in temperature cause vaporization.


A pigtail-shaped pipe or a drop leg in the pipe leading to a steam pressure gauge, serving to trap water in the gauge and prevent overheating from direct contact with steam.


The process whereby a volume of liquid is converted into a multiplicity of small drops. The principal goal is to produce a high surface area to mass ratio so that the liquid will vaporize quickly and thus be susceptible to combustion.


The number of pounds per square inch of pressure drop in a boiler from the point where the safety valve pops to the point where the safety valve reseats.


Boil-off is the vapor produced above the surface of a boiling cargo due to evaporation. It is caused by heat ingress or a drop in pressure.

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