2.5ohm
Total resistance in a parallel circuit is less than any of the individual resistances: Rtotal = 1 / (1/R1 + 1/R2 + . . . 1/Rn)
Resistors are said to be connected together in parallel when both of their terminals are respectively connected to each terminal of the other resistor or resistors.
From 1/R=1/r1 +1/r2+ 1/rn for resistors in parallel you will find that 4ohm resistors in parallel are equivalent to 2 ohms.in a Parallel circuit with the following formula: 1/Rt = 1/R1 + 1/R2 + 1/R3 + .The total resistance of a parallel circuit is NOT equal to the sum of the resistors (like in a series circuit).
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