Final answer:
The approximate real power in the given three-phase system, with a line voltage of 220 V, a line current of 5 A, and a power factor of 0.7, is calculated as 1351.7 W, which is closest to the provided choice A. 1770 W.
Step-by-step explanation:
The real power in a three-phase system can be calculated using the formula P = √3 × V_{L} × I_{L} × PF, where V_{L} is the line voltage, I_{L} is the line current, and PF is the power factor.
Given that V_{L} = 220 V, I_{L} = 5 A, and PF = 0.7, we can substitute these values into the formula:
P = √3 × 220 V × 5 A × 0.7
P = √3 × 220 × 5 × 0.7 × × 1351.7 W
Therefore, the approximate real power is 1351.7 W, which is closest to the choice labeled as A. 1770 W (which seems to be a typo or miscalculation in the options provided).