Ohms Law,Series and Parallel circuits, Kirchoff's Current Law(KCL),Kirchoff's voltage Law(KVL),power equation,

Ohms Law:

If temperature and other physical condition remain constant, then power flow through the conductor is directly proportional to the potential difference.

Kirchoff's current Law:(KCL)

The algebraic sum of current meeting at any point is zero in any closed network.

Kirchoff's voltage Law:(KVL)

The algebraic sum of voltage drop+The induced emf is zero in any closed network.

Power Equation:-

We know that,P=IE...........(i)

As per Ohms law,we know that,I=E/R

Combined with power equation, P=IE

We get ,P=E(E/R)

Or,P=E^2/R,from ohms law we know that E=IR,combine this with P=IE,we get,P= I^2R.