Resistivity—

The  resistance R of a conductor is

The resistivity or specific resistance of a material may be defined as the resistance of a conductor of that material, having unit length and unit area of cross section.

Ohm’s Law—

Ohm’s law states that the current flowing through a conductor is directly proportional to the potential difference applied across its ends, provided the temperature and other physical conditions remain uncharged.

V=IR

Where, R is proportionality constant and known as Resistance of The Conductor.

Electric Current—

Electric Current in a conductor across an area held perpendicular to the direction of flow of charge is defined as the amount of charge flowing across that area per unit time.  

Its unit is ampere or Coulomb/sec.

Combination of Capacitor—

Capacitor are combined in two manner

1. Series Combination
2. Parallel combination

Series Combination of Capacitor—

When capacitors are arranged such that negative plate of one capacitor is connected to the positive plate of second one and the negative plate of second capacitor is connected to positive plate of third capacitor and so on, the arrangement is called series combination.