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Three resistor are connected in series. R1=5kΩ, R2=20kΩ, and R3 is not known. Without knowing the value of 3rd resistor, identify the possible value of Req

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Three resistor are connected in series. R1=5kΩ, R2=20kΩ, and R3 is not known. Without knowing the value of 3rd resistor, identify the possible value of Req
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Solution 1

In a series circuit, the total resistance (Req) is the sum of the individual resistances. Therefore, the minimum value for Req would be the sum of R1 and R2, since R3 cannot be negative.

Step 1: Add R1 and R2 R1 + R2 = 5kΩ + 20kΩ = 25kΩ

So, the minimum possible value for Req is 25kΩ.

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