The EMF of the current source is 220 volts, the internal resistance is 1.5 ohms. What is the resistance of the external
| July 6, 2021 | education
The EMF of the current source is 220 volts, the internal resistance is 1.5 ohms. What is the resistance of the external section of the circuit to take so that the current strength is equal to 4A?
These tasks: ε (EMF in the current source) = 220 V; r (internal resistance) = 1.5 ohms; I (required current in the source) = 4 A.
We express the required resistance of the external section of the circuit from the formula: I = ε / (r + R), whence r + R = ε / I and R = ε / I – R.
Calculation: R = 220/4 – 1.5 = 55 – 1.5 = 53.5 Ohm.
Answer: The outer section of the circuit should have a resistance of 53.5 ohms.
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