Question

If the Signal Generator has a finite internal resistance R, like a battery, what is the relation between the ideal source V., R., and Rex, the resistance of the circuit to which it is attached? How does the voltage across the external circuit vary with REX? (The discussion above provides expressions for Zex, but it is not directly measured in this experiment.)

Answer 1

The relation between the ideal source voltage (V.), the internal resistance (R), and the resistance of the external circuit (Rex) is given by Ohm's law. The voltage across the external circuit (Rex) varies inversely with the external resistance.

Step-by-step explanation:

The relation between the ideal source voltage (V.), the internal resistance (R), and the resistance of the external circuit (Rex) is given by Ohm's law.

The ideal source voltage (V.) is equal to the product of the current (I) and the sum of the internal resistance (R) and the external resistance (Rex). Mathematically, V. = I * (R + Rex).

The voltage across the external circuit (Rex) varies inversely with the external resistance. As the external resistance increases, the voltage across the external circuit decreases.