The current in the circuit is I = 0.50 A. Determine the external resistance of the circuit R if the internal resistance

The current in the circuit is I = 0.50 A. Determine the external resistance of the circuit R if the internal resistance of the current source is r = 2.0 Ohm, and its EMF = 11V

To find the external resistance of a given circuit, we apply the formula: I = ε / (R + r), whence we express: R = ε / I – r.

Values of variables: ε – EMF of the current source (ε = 11 V); I is the current in the circuit (I = 0.5 A); r – internal resistance (r = 2 ohms).

Let’s calculate: R = ε / I – r = 11 / 0.5 – 2 = 20 Ohm.

Answer: The external resistance of the given circuit is 20 ohms.