# Total Resistance-Rt

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• #10220
Keymaster

How i can get Total resistance in a parallel circuit.

Rt = 1/ R1 + 1/R2

Rt=?, kindly show how to  calculate,

#11416
Keymaster

Hello

The correct is   1/Rt = 1/R1 + 1/R2, you can also do Rt=R1*R2/(R1+R2)

#11417
Keymaster

Im not sure if that is correct, perhaps maybe Rt=R1+R2/R1(R2)

#11413
Keymaster

1/R=1/r1 + 1/r2

so; R = r1*r2/(r1 +r2)

#11412
Keymaster

For Parallel Circuit, the general formula is:

1/Rt = 1/R1 + 1/R2 + 1/R3 + ….+ 1/Rn   where “n” is the number of resistor connected in parallel. This means that the reciprocal of the total resistance is equal to the sum of the reciprocals of the given resistances. For two resistors, 1/Rt = 1/R1 + 1/R2. Simplifying this equation, Rt = (R1*R2)/(R1 + R2). For three resistors in parallel, 1/Rt = 1/R1 + 1/R2 + 1/R3. Also equal to Rt = R1*R2*R3/(R2*R3 + R1*R3 + R1*R2). And so on…

#12258
s
Participant

1/Rt=1/R1+1/R2+1/R3+………………….+1/Rn

Rt = Total resistance

n = number of parallel circuits

Also the same formula can be used for Z

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