the question is"what is resistor ?what is getting resisted?
Every one knows that "current" is nothing but flow of electrons just like water flow through a pipe.
here pipe means any conducting wire.The operation of pump is similar to that of a battery.Tap is nothing but a switch in the circuit
look at the following image
we cannot use a resistor of more length in our circuits so we use resistors of different materials are available in several sizes.
the ordinary resistor we use in the laboratory consist of a color coding on it.depending upon the color band pattern printed on it we can find the resistance.look at the figure below
consider the following example:
yellow violet red gold
4 7 10^2 +-5%
R= 4700 ohm = 4.7 K ohm