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five resistance of 25 ohm each are connected in parallel five such combination are connected in series what is the total resistance |
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Answer» The TOTAL resistor value is 7 OHMS, and in series resistances, the VALUES are summed together. So when one of the series resistors is 5 ohms, the other is 2 ohms. The second resistance is expressed as a series of parallel resistances. The equivalent value of the parallel DOSE equals the sum of the inverse of each resistor: 1/R=1/R1+1/R2+ … + 1/RN We know R must be 2 ohm and R1, R2, .. Rn are 6 ohm, so: 1/2=n/6 => n = 3 |
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