Formula of flexible heater

Ohm’s law
I=U/R
 
Joule's law:
 
Q=I²Rt
Q=UIt=Pt=UQ(Power)=U²t/R
 
 
I=I1=I2
U=U1+U2
R=R1+R2
U1/U2=R1/R2
P1/P2=R1/R2
 
Parallel circuit:
 
I=I1+I2
U=U1=U2
1/R=1/R1+1/R2 [ R=R1R2/(R1+R2)]
I1/I2=R2/R1
P1/P2=R2/R1
 
Resistance
 
I1/I2=U1/U2
P1/P2=I12/I22
P1/P2=U12/U22
 
Electric Power
 
W=UIt=Pt=UQ
W=Iˆ2Rt=Uˆ2t/R
 
Watt:
 
P=W/t=UI
P=Iˆ2R=Uˆ2/R