What is the internal resistance of a current source with an EMF equal to 220 V, if, when a 40 (Ohm) resistor
| August 5, 2021 | education
What is the internal resistance of a current source with an EMF equal to 220 V, if, when a 40 (Ohm) resistor is connected to it, a current of 25 A flows through the electrical circuit?
Initial data: Еі (EMF of the current source) = 220 V; R (resistor resistance, external source resistance) = 40 Ohm; I (current in the electric circuit) = 2.5 A.
The internal resistance of this current source is determined from the formula for calculating the EMF: Еі = I * (R + r), whence r = Еі / I – R.
Let’s make a calculation: r = 220 / 2.5 – 40 = 88 – 40 = 48 Ohm.
Answer: The internal resistance of the current source is 48 ohms.
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