February 8, 2017. The National Institute of Standards and Technology (NIST) is a standards laboratory that is part of the U.S. Department of Commerce. The NIST traceable calibration refers to a program that certifies that the equipment used by labs or manufacturing facilities is properly calibrated according to the industry standards in place.
Quick Answer. VAC is an electrical voltage in an alternating current circuit. The power system supplying homes and businesses in the United States uses AC 120 V, while in Europe the system uses AC 240 V. Continue Reading.
The apparent power for dc circuits is simply the voltage (Vdc) times the current (Idc): VA = Vdc x Idc (3) The apparent power for dc circuits is the same as real power for dc circuits (for dc, VA = W). For ac circuits, VA are the product of the RMS voltage (VRMS) times the RMS current (IRMS):