Electrical Code or Electrical Contractor: EF: Exhaust Fan: ELEV: Elevator: EM: Emergency: EMT: Electrical Metallic Tubing: EP: Emergency Power: EPO: Emergency Power Off (Button or Switch) EWC: Electric Water Cooler: F: Fuse: FA: Fire Alarm: FAA: Fire Alarm Annunciator: FLA: Full Load Amperes: FMC: Flexible Metal Conduit: G: Ground: GFCI, GFI: Ground Fault Circuit Interrupter: GND: Ground: GRMC
The hypergeometric distribution is used for sampling without replacement. The density of this distribution with parameters m, n and k (named Np, N-Np, and n, respectively in the reference below) is given by. p(x) = choose(m, x) choose(n, k-x) / choose(m+n, k) for x = 0, â¦, k.
A Venturi meter constricts the flow in some fashion, and pressure sensors measure the differential pressure before and within the constriction. This method is widely used to measure flow rate in the transmission of gas through pipelines, and has been used since Roman Empire times.