Puneet

toc =Date:- 28 March: Resistivity= studying the resistance equation R= row l/A where R= the resistance, l=length and A= the cross sectional area of the wire.

now to prove this relation we need to perform an equation. the different current will effect the voltage and the current in the circuit also the light intensity of the bulb.

Rough note for the experiment made by using DrawPad for iPad.

factors affecting resistivity:- -Temperature -Material

Factors affecting Resistance:- -Length -Cross sectional area -Material -Temperature. Apart from these some also depend on: -light intensity (LDR) -magnetic field intensity.

Ohm's Law:- The law states that when temperature and other factors remain constant, the current passing through a conductor is directly proportionate to the voltage applied across the circuit. therefore V=IR.

In a circuit, When the Resitiance is increased/decreased the current in the circuit would decrease/increase keeping the Voltage constant no matter what.

From Ohm's Law. deriving the definition of Resistance we get:- Resistance is the ratio of the Voltage across the conductors to the current flowing in the circuit and its unit is "Ohm".

=Date :- 27 March: Resistance at molecular level=

Resistance at molecular level

Cause of Flow of Electric current : the cause of the flow of electric current is when the battery is connected to the circuit. ( an external electric field is given).

Free electrons:- the electrons from the valence shell of an atoms come out and move about freely inside the conductor.

electric current:- rate of flow of charge. I= Q/T. its unit is Ampere (a). the electric current flows in the opposite direct as to the electrons.

Resistance :- when electricity is passed through a element and it faces a hinderance or obstruction caused by the material it is made of.

Temperature:- temperature and resistance are directly proportionate as when we increase/decrease the temperature, the energy of the electrons increases/decreases with it.

Data Analysis =media type="custom" key="13557980"=

= = =Date:- 13 March: differences between isothermal and adiabatic.=


 * Isothermal || Adiabatic ||
 * temperature is constant || No heat given in or out ||
 * slow process || fast process ||
 * less steep graph || steeper graph ||