V=Voltage (volts )
R=Resistor (ohms)
I=Intensinty (Amperes)
W= Power

 V=R*I
 R=V/I
 I=V/R
 W=V*I

Serial resistors:

 RMaster  =R1+R2+R3+.......
 I=V/RMaster

Parallel resistors

 IMaster =V/R1 +V/R2 +V/R3 + .....
 RMaster=1/(1/R1)+(1/R2)+(1/R3)+......

Mixed circuits 

  You need to solve the circuits independently  until it is an only circuit