Number of primary turns

Suppose 10,000 V, j (e.g., from an electrical power plant generator) is input to a transformer where the number of secondary turns is 75 times more than the number of primary turns. Then the voltage from the secondary will be 75 X 10,000 = 750,000... 

So even with no information about the permeability of the material, air gap, and so on, we already know the number of turns required on a core with area Ae that will produce a certain B-field. We also know that with or without an air gap, the B-field should not exceed 0.3 T for most ferrites. So solving the equation for N (N is np here, number of primary turns),... 

Vp = the primary voltage /s = the secondary voltage Np = the number of primary turns Ns = the number of secondary turns... 

We realized that using a low boiling liquid in a microwave environment, even on a small scale, did not constitute best practice and as for hydrogenations our thoughts turned to using formates in a modified Eshweiler-Clarke reaction [65-67] and successfully methylated a number of primary and secondary amines under microwave conditions (Scheme 13.6) [68]. 

The primary products formed from the starting alkane will react in their turn to produce secondary products. Taking the large number of primary products which are generated into account, it is not possible to write a detailed mechanism analogous to that of the... 

A 230V to 12V emergency lighting transformer is constructed with 800 primary turns. Calculate the number of secondary turns required. Collecting the information given in the question into a usable form, we have ... 

The thiobarbituric acid test (TBA) is a preferred method for detecting lipid peroxidation in biological systems. However, the reaction is nonspecific since a number of primary and secondary products of lipid peroxidation form malonaldehyde which in turn reacts in the TBA test. In food containing oleic and linoleic acids, the TBA-test is not as sensitive as the Fe +-test outlined above. 

Superhelical density cr) is the number of superhelical turns per turn in the relaxed primary helix, i.e., cr = W/T. The superhelicity can be modulated by several means the most important are DNA intercalating agents. 

Radiation Damage. It has been known for many years that bombardment of a crystal with energetic (keV to MeV) heavy ions produces regions of lattice disorder. An implanted ion entering a soHd with an initial kinetic energy of 100 keV comes to rest in the time scale of about 10 due to both electronic and nuclear coUisions. As an ion slows down and comes to rest in a crystal, it makes a number of coUisions with the lattice atoms. In these coUisions, sufficient energy may be transferred from the ion to displace an atom from its lattice site. Lattice atoms which are displaced by an incident ion are caUed primary knock-on atoms (PKA). A PKA can in turn displace other atoms, secondary knock-ons, etc. This process creates a cascade of atomic coUisions and is coUectively referred to as the coUision, or displacement, cascade. The disorder can be directiy observed by techniques sensitive to lattice stmcture, such as electron-transmission microscopy, MeV-particle channeling, and electron diffraction. 

The first step is to determine the number of turns needed for the primary winding. For this, the parameters from the core data sheet of the particular core and core material are used. Also, the minimum level of flux density already should have been determined (refer to Appendix D). The equation for determining the number of turns for the primary winding in the CGS System (U.S.) is... 

The should be approximately one-half the saturation flux density (5sat) at 100°C. A5inax of 1800 to 2500G (0.18 to 0.25T) is satisfactory. To determine the number of turns on the primary, use Equations 3.36a and 3.36b. 

The maximum number of turns required for the primary winding is... 

Solve for the number of turns on the primary winding. (Use Equation 3.20 a, b, or e. This transformer is designed the same way as a forward-mode power transformer). 

The majority of power transformers change the voltage from one side of the transformer to the other. The change in voltage is directly related to the number of turns each conductor (primary and... 

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