obtaining condition p/q=r/s
The term, 'null', simply means 'none' -so, 'null voltage' means 'no voltage'.Most bridge circuits require you to achieve a 'null reading' on its measuring instrument, when using the circuit to determine resistance (in the case of the Wheatstone Bridge), etc.
A Murray Loop Test is used to locate faults in networks of cables such as three-phase services, groups of underground cables, etc. It works by using the principle equation on which the Wheatstone bridge is based: when the galvanometer is in a null condition, R1/R3=R2/R4. The location of a cable fault within a network can be found by using a process of elimination: good connections are identified and are then excluded from further iterations of the Murray Loop Test.
You mean SQL? NULL = anything IS NULL NULL <> anything IS NULL ... NULL IS NULL = TRUE NULL IS NOT NULL = FALSE
The Periodic Table Of Elements has a well defined order. The layout can be emulated easily since the arrangement is quite logical.The first step would be to define a struct containing the following members as a minimum:- atomic number (int - number of protons in its nucleus)- symbol (char* - short form of the element name)- name (char* - long form of the element name)i.e.:struct elementinfo {int atomicnumber;char *symbol, *name;};Other members can be added as your program develops.The next step is to arrange the table itself. If you're using Win32 or another graphical system, it's a matter of drawing a box (Win32 would require a MoveToEx() call and four LineTo() calls) and TextOut() (or a related function) for the atomic number and element symbol (centered horizontally and aligned top and bottom respectively).Including conio.h or curses.h would give you the ability to position the cursor and even change the text color, allowing for an alternate "graphical" method.To keep things simple, storing the elements in an array would require something akin to the following:struct elementinfo elementlist[]={{1, "H", "Helium"}, {0, NULL, NULL}, {0, NULL, NULL},{0, NULL, NULL}, {0, NULL, NULL}, {0, NULL, NULL},{0, NULL, NULL}, {0, NULL, NULL}, {0, NULL, NULL},{0, NULL, NULL}, {0, NULL, NULL}, {0, NULL, NULL},{0, NULL, NULL}, {0, NULL, NULL}, {0, NULL, NULL},{0, NULL, NULL}, {0, NULL, NULL}, {2, "He", "Helium"},{-1, NULL, NULL},{3, "Li", "Lithium"}, {4, "Be", "Beryllium"}, {0, NULL, NULL},{0, NULL, NULL}, {0, NULL, NULL}, {0, NULL, NULL},{0, NULL, NULL}, {0, NULL, NULL}, {0, NULL, NULL},{0, NULL, NULL}, {0, NULL, NULL}, {0, NULL, NULL},{5, "B", "Boron"}, {6, "C", "Carbon"}, {7, "N", "Nitrogen"},{8, "O", "Oxygen"}, {9, "F", "Fluorine"}, {10, "Ne", "Neon"},{-1, NULL, NULL},...{-2, NULL, NULL}};In the above array, {0, NULL, NULL} represents a blank displayed for that particular cell, and {-1, NULL, NULL} represents a newline. The {-2, NULL, NULL} signifies the end of the table. The following for() loop would wrap around your display code like so:for (count=0; elementlist[count].atomicnumber!=-2; count++) {if elementlist[count].atomicnumber==-1) {// jump to next line of elements}else {// display current element}}Drawing this graphically, you'd have to keep track of the current cursor (X, Y) position.If you are sending this to stdout or another text stream (i.e. text file), you could draw each line, referencing the array of elements as you go. The list of elements would have to be stored in a nested array: the outermost array contains each line of elements in an array. This would do away with the {-1, NULL, NULL} terminating each line of elements.Extending this code to use classes would be relatively simple, but might only make sense if you were drawing this graphically storing each element as an object.The Lanthanides and Actinides, since they're displayed separately from the main table, would probably have to be stored separately for sake of convenience.Also, as laboratories continue to synthesize (or, on the rare chance, discover) new elements, the layout of the table may change (even drastically) to suit. Thus, the code would have to be altered accordingly.See the related links below for more ideas on how to design a program that displays the Periodic Table of Elements.(Note: Code originally posted was copyrighted. Added to related links.)
in Russian Null means zero. in some languages Null is a macro for zero. in others Null is a single-tone object which referes to the value Null and thus could be compared to other values. Null has many names from nill Nill nil in diffrent languages. most of the time, Null is used to indicate, no value is set to a variable.
The term, 'null', simply means 'none' -so, 'null voltage' means 'no voltage'.Most bridge circuits require you to achieve a 'null reading' on its measuring instrument, when using the circuit to determine resistance (in the case of the Wheatstone Bridge), etc.
disandvantage:-the wheatstone bridge is not applicable for high resistances advantage:-1)it shows a null measurement(i.e.-potential difference across the end points of the bridge is zero) 2)since it is an arrangement of 4 resistors ...it is useful to find one of them in terms of other 3
Wheatstone bridgethe null detector is used to match a known quantity to an unknown onethe null detector has several sensitivity rangesat the highest sensitivity range you put almost no load on the device under test
By using wheatstone bridge principle we can proceed to find the phase to phase fault's.i:e the wheatstone bridge is mainly used to find the resistances/inductance/capacitances.it is mainly consists of 4 resistances like this(<>)& having a galvanometer in centre&a battery is connected to it. when ever the current flowing through the galvanometer is zero by varying the one resistance,then the ratio of two resistances connected at one end is equal to other two resistances ratio.By using the same principle ,one phase is connected to known resistance and a good cable is shorted to the fault cable.and other resistane is connected to the good cable&a galvanometer is connected to it.by varying the resistances the galvanometer shows null reading.then bridge is balanced & by using bridge equation we can solve to find the distance where the error is located
In a meter bridge, the jockey is used to slide along the wire to make contact with the resistance wire and balance the bridge by finding the null point. This allows for accurate measurement of unknown resistance by comparing it with a known resistance.
A Murray Loop Test is used to locate faults in networks of cables such as three-phase services, groups of underground cables, etc. It works by using the principle equation on which the Wheatstone bridge is based: when the galvanometer is in a null condition, R1/R3=R2/R4. The location of a cable fault within a network can be found by using a process of elimination: good connections are identified and are then excluded from further iterations of the Murray Loop Test.
You mean SQL? NULL = anything IS NULL NULL <> anything IS NULL ... NULL IS NULL = TRUE NULL IS NOT NULL = FALSE
used to measure low Resistance since it must reach a null.
There is no null, it is just what it says when you log out. There is a null.
No. Your second marriage is null and void if you were already married. You must have lied on your application for your second marriage license or it would not have been issued. You must obtain a divorce from your spouse and then marry your new spouse.No. Your second marriage is null and void if you were already married. You must have lied on your application for your second marriage license or it would not have been issued. You must obtain a divorce from your spouse and then marry your new spouse.No. Your second marriage is null and void if you were already married. You must have lied on your application for your second marriage license or it would not have been issued. You must obtain a divorce from your spouse and then marry your new spouse.No. Your second marriage is null and void if you were already married. You must have lied on your application for your second marriage license or it would not have been issued. You must obtain a divorce from your spouse and then marry your new spouse.
thanks for your response! teacher4life
"NULL" is usually pronounced as "null" (rhymes with "mull").