Ohm's Law - states that the current through a conductor between two points is directly proportional to the potential difference or voltage across the two points, and inversely proportional to the resistance between them.
In simpler words, it means
voltage current ; resistance 
current
The picture below shows Ohm's triangle.
Each arrangement, such as series, parallel, or series-parallel, affect the way in which potential difference and current act in various parts of the circuit. Kirchoff research of the different behaviours of the circuits led to the following laws.....
Kirchoff's Current Law
The total amount of current into a junction point of a circuit equals the total current that flows out of that same junction.
In a series circuit...
IT = I1 = I2 = I3 =…= In
In a parallel circuit...
IT = I1 + I2 + I3 +…+ In
Kirchoff's Voltage Law
The total of all electrical potential decreases in any complete circuit loop is equal to any potential increases in that circuit loop.
In a series circuit...
VT = V1 + V2 + V3 +…+ Vn
In a parallel circuit...
VT = V1 = V2 = V3 =…= Vn
His laws are particular applications of the laws of conservation of electric charge and the conservation of energy.
à In any circuit, there is no net gain or loss of electric charge or energy
In a series circuit...
RT = R1 + R2 + R3 +…+ Rn
In a parallel circuit...
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