The potential difference at the terminals of the open current source is 4 V. Determine the internal resistance of the current source if the current strength is 0.8 A.
Initial data: φ1 – φ2 (potential difference at the terminals of an open source) = 4 V; R (resistance of the outer section of the circuit) = 4 ohms; I (current in the current source) = 0.8 A.
The internal resistance of the current source is determined from the formula: φ1 – φ2 = I * (R + r), whence r = φ1 – φ2 / I – R.
Let’s calculate: r = 4 / 0.8 – 4 = 5 – 4 = 1 Ohm.
Answer: According to the calculation, the internal resistance of the current source is 1 ohm.
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