when we connect resistance at parallel we must calculate the equivalent resistance , and to do this we must know some properties about this state , firstly the voltage is constant between any two point in the circuit , so when we change the wire fore example from the wire which R1 in it ro the wire which R2 in it the voltage keep constant and to understand more about this matter we can explain about this speech by this equation :
V1 = V2
R1 * I1 = R2 * I2
Ieq = I1 + I2
Vab / Req = Vab / R1 + Vab / R2
We can know write the equation without Vab :
1 / Req = 1 / R1 + 1 / R2
and by this equation we can get the value of the equivalent resistance
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