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How do I find loaded resistance in a circuit using a potentiometer and a multimeter?
Actually I want to find the loaded resistance or Rth(thevenin) or Rn(norton) in a circuit. I've been given a normal circuit with a power source, several resistors, and 2 unloaded terminals of A and B connected to it. I've also given a multimeter and a potentiometer. How do I find the value of Rth or Rn?
I know how to find the Rth or Rn is by removing the power supply and connect the terminals using a multimeter that is set at resistance and the value that shown on the multimeter is the value of Rth and Rn, but now, the circuit cannot be adjusted or taken out. It is like the circuit is inside a box where you cannot open it and the terminal is outside the box.
So how do I find the value of Rth or Rn of a circuit with 2 terminals that is fixed using a multimeter and potentiometer?
You don't need the potentiometer.
V(th) = voltage measured across the terminals with no load.
Volt meter only connected between A and B terminals
I(th) = short circuit current between the terminals (amp meter)
Amp meter only connected between A and B terminals
R(th) = V(th) / I(th)
R(no) = R(th)
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