In Finland it is called the virsta . Up to about HV 500, the Vickers hardness is about 1.04 times the Brinell hardness. This was roughly 30 acres or 12 hectares . The grade numbers are approximately equal to the kinematic viscosity of the lubricant in centi stokes . Separating electric charges creates potential energy, which can be measured in energy units such as joules .
Electric potential is defined as the amount of potential energy present per unit of charge.
Electric potential is measured in volts, with one volt representing a potential of one joule per coulomb of charge. The product of the potential and the actual current is the load, in volt amperes. To solve this problem, the American Standards Association decided in 1951 to establish as a reference a signal which generates 1 milliwatt of power in a circuit having an impedance of 600 ohms . The volume of an incoming signal, in volume units, is equal to the number of decibels by which it exceeds this reference level. Return to the Dictionary Contents page .