What is the internal resistance of the element if its EMF s = 1.2v and external resistance R = 5 Ohm, current I = 0.2 A.
| September 5, 2021 | education
Task data: Еі (EMF element) = 1.2 V; R (external resistance of the element) = 5 Ohm; I (effective current in the cell) = 0.2 A.
The internal resistance of this element can be determined from the formula for calculating the EMF: Еі = I * (R + r), whence R + r = Еі / I and r = Еі / I – R.
Let’s calculate: r = 1.2 / 0.2 – 5 = 6 – 5 = 1 Ohm.
Answer: The resistance of this element is 1 ohm.
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