Determine the amperage at the substation of the oil field, which includes four oil rigs with a resistance of 160 Ohm, 175 Ohm, 205 Ohm and 190 Ohm, respectively. voltage at substations 380 V.
Data: R1 (resistance of the first oil rig) = 160 Ohm; R2 (second tower) = 175 Ohm; R3 (third tower) = 205 ohms; R4 (fourth tower) = 190 Ohm; U (substation voltage) = 380 V.
1) Serial connection of oil rigs: R = R1 + R2 + R3 + R4 = 160 + 175 + 205 + 190 = 730 Ohm and I = U / R = 380/730 = 0.52 A.
2) Parallel connection of oil rigs: 1 / R = 1 / R1 + 1 / R2 + 1 / R3 + 1 / R4 = 1/160 + 1/175 + 1/205 + 1/190; R = 45.24 ohms and I = U / R = 380 / 45.24 = 8.4 A.
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