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for the layman a function indicates a relationship among objects a function provides a model to describe a system economists
the magnetic circuitin an electric circuit a current is established due to the existence of an electromotive force in the same way in a magnetic
rule 1the logarithm of 1 to any base is 0proofwe know that any number raised to zero equals 1 that is a0 1 where a takes any value therefore
we know that 24 16 and also that 2 is referred to as the base 4 as the index or power or the exponent the same if expressed in terms of
magnetic materialsferromagnetic materialsferromagnetic materials can be easily magnetised and exhibit strong magnetic properties this group can be
properties of lines of fluxto make the imaginary lines of flux describe the behaviour of the magnetic field we must give them appropriate
consider this you have four units a b c and d you are asked to select two out of these four units how do you go about this particular
magnetismeveryone has seen and handled a magnet in the form of a straight or horseshoe-shaped bar of steel or steel-alloy the magnet was originally
when three quantities a b and c are in gp then the geometric mean b is calculated as followssince these
learning geometric progression vis-aacute-vis arithmetic progression should make it easier in geometric progression also
when three quantities are in ap then the middle one is said to be the arithmetic mean of the other two that is if a b and
capacitor constructionfixed capacitorsfixed capacitors usually consist of sheets of metal foil between which is sandwiched the dielectric or
we know that the terms in an ap are given bya a d a 2d a 3d a n - 2d a n - 1dthe sum of all
factors affecting capacitancethe factors which affect the capacitance of a parallel-plate capacitor are overlapping area of the plates a the
a series is said to be in arithmetic progression ap if the consecutive numbers in the series differs by a constant value this
capacitanceif we increase the voltage between the plates the charge increases but the ratio of charge to voltage remains the same this ratio
capacitorswhen a voltage is applied to a capacitive circuit there is a change in the electric flux the ease with which this change takes place is a
electrical energyelectrical energy is the ability of an electrical system to do workenergy is expended when work is done and the amount of energy
electrical workelectrical work is done if a quantity of charge coulombs is moved between two points which are at different electrical potentials the
methodin this method we eliminate either x or y get the value of other variable and then substitute that value in either of the
before we look at simultaneous equations let us brush up some of the fundamentals first we define what is meant by an equation it is a
the effects of short circuitsa short circuit is a path for current where a path should not exist the path is generally considered to have a low
in this part we look at another method to obtain the factors of an expression in the above you have seen that x2 - 4x 4 x - 22 or
example factorize x2 - 4x 4if we substitute x 1 the value of the expression will be 12 - 41 4 1if we substitute x -1 the
above we have seen that 2x2 - x 3 and 3x3 x2 - 2x - 5 are the factors of 6x5 - x4 4x3 - 5x2 - x - 15 in this case we are able to find