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A change of one bel in the level corresponds to a 10× change in power, so when comparing power quantities x and y, the difference is defined to be 10×log 10 (y/x) decibel. With root-power quantities, however the difference is defined as 20×log 10 (y/x) dB. [3]
Thermal power stations in Sri Lanka now roughly match the installed hydroelectric generation capacity, with a share of nearly 49% of the available capacity in December 2013 and 40% of power generated in 2013. [9] Thermal power stations in Sri Lanka runs on diesel, other fuel oils, naptha or coal. [9]
In 1912 the first 110 kV-overhead power line entered service followed by the first 220 kV-overhead power line in 1923. In the 1920s RWE AG built the first overhead line for this voltage and in 1926 built a Rhine crossing with the pylons of Voerde , two masts 138 meters high.
Had a very minor industrial line 308 Guinea-Bissau: 624 Guyana: Had a number of public lines until the 1970s and industrial lines until around 2007 [89] 328 Haiti: Rails still in Port-au-Prince from railway from factories to port, left out of service since the 1970s. 332 Iceland: Had short industrial lines, see Rail transport in Iceland for ...
One ammonam was equal to 203.4 L. [1] One parrah = 1 ⁄ 8 ammonam, oneseer = 1 ⁄ 288 ammonam and the chundoo was equal to nearly half a pint. [2] Maccauly stated in 1818 that to the north of Colombo an Ammonam contained 16 Parahs, and 2 + 1 ⁄ 2 Ammonams equalled one Acre, but that to the south there were 8 Parahs to the Ammonam.
Inverting this process allows square roots to be found, and similarly for the powers 3, 1/3, 2/3, and 3/2. Care must be taken when the base, x, is found in more than one place on its scale. For instance, there are two nines on the A scale; to find the square root of nine, use the first one; the second one gives the square root of 90.
A root of degree 2 is called a square root and a root of degree 3, a cube root. Roots of higher degree are referred by using ordinal numbers, as in fourth root, twentieth root, etc. The computation of an n th root is a root extraction. For example, 3 is a square root of 9, since 3 2 = 9, and −3 is also a square root of 9, since (−3) 2 = 9.
The rod, perch, or pole (sometimes also lug) is a surveyor's tool [1] and unit of length of various historical definitions. In British imperial and US customary units, it is defined as 16 + 1 ⁄ 2 feet, equal to exactly 1 ⁄ 320 of a mile, or 5 + 1 ⁄ 2 yards (a quarter of a surveyor's chain), and is exactly 5.0292 meters.