Series vs Parallel Circuit Formulas
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Formula for total resistance in a parallel circuit
1/(Rt)=1/(R1)+1/(R2)+1/(R3)
Formula for total current in a parallel circuit
It=I1+I2+I3
Formula for total current in a series circuit
It=I1=I2=I3
Formula for total resistance in a series circuit
Rt=R1+R2+R3
Formula for total voltage in a series circuit
Vt=V1+V2+V3
Formula for total voltage in a parallel circuit
Vt=V1=V2=V3