A 1km long telegraph wire has a resistance of 5.6 ohms. The current in the wire is 7mA. What is the voltage at the ends of this wire?
| January 11, 2021 | education
Initial data: L (length of the telegraph wire) = 1 km; R (the resistance that the telegraph wire has) = 5.6 ohms; I (current in the wire) = 7 mA (7 * 10-3 A).
The voltage at the ends of the telegraph wire can be calculated using the formula: U = I * R = 7 * 10-3 * 5.6 = 0.0392 V ≈ 0.04 V.
Answer: The voltage at the ends of the telegraph wire is 0.04 V.
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