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The sign of the weight of a tensor density, such as the weight of the determinant of the covariant metric tensor. The active and passive sign convention of current, voltage and power in electrical engineering. A sign convention used for curved mirrors assigns a positive focal length to concave mirrors and a negative focal length to convex mirrors.
Illustration of the "reference directions" of the current (), voltage (), and power () variables used in the passive sign convention.If positive current is defined as flowing into the device terminal which is defined to be positive voltage, then positive power (big arrow) given by the equation = represents electric power flowing into the device, and negative power represents power flowing out.
The convention revised and substantially extended the earlier 1949 Geneva Protocol on Road Signs and Signals, [1] itself based in turn on the 1931 Geneva Convention concerning the Unification of Road Signals. Amendments, including new provisions regarding the legibility of signs, priority at roundabouts, and new signs to improve safety in ...
Sign conventions are defined here since different conventions can be found in the literature. [5] In this article, a right-handed coordinate system is used with the x {\\displaystyle x} axis to the right, the z {\\displaystyle z} axis pointing upwards, and the y {\\displaystyle y} axis pointing into the figure.
Sign at the Republic of Ireland–United Kingdom border indicating that limits in the Republic are shown in km/h. Blue metric conversion reminder sign used in Ontario, Canada near the US border. All countries, with the exception of the United States and the United Kingdom, use the metric system. Some countries mark this fact by using units on ...
This article follows sign-convention # 3, as shown. In the Mohr-circle-space sign convention, normal stresses have the same sign as normal stresses in the physical-space sign convention: positive normal stresses act outward to the plane of action, and negative normal stresses act inward to the plane of action.