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@mibe21_: #uocduoclenxuhuong #xhuongtiktok
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Tuesday 18 August 2026 18:35:25 GMT
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2026-08-18 18:40:07
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This image explains some basic electrical calculations used in electrical engineering and motor systems. 1. Single-Phase Power Formula: P = V × I Where: P = Power (Watts) V = Voltage (Volts) I = Current (Amps) Example: Voltage = 230 V Current = 5 A Calculation: 230 × 5 = 1150 W Result: Power = 1150 Watts 2. Three-Phase Power Formula: P = √3 × V × I × PF Where: √3 = 1.732 V = Line Voltage I = Line Current PF = Power Factor Example: Voltage = 415 V Current = 15 A Power Factor = 0.8 Calculation: 1.732 × 415 × 15 × 0.8 ≈ 8.63 kW Result: Power = 8.63 kW 3. Motor Current Formula: I = P / (√3 × V × PF × η) Where: P = Motor Power V = Line Voltage PF = Power Factor η (eta) = Motor Efficiency Example: Power = 11 kW Voltage = 415 V Power Factor = 0.85 Result: Current = 20.5 A 4. Star (Y) Connection In a star connection: Phase Voltage = Line Voltage ÷ √3 Current = Phase Voltage ÷ Resistance Example: Line Voltage = 415 V Resistance = 25 Ω Calculation: Phase Voltage = 415 ÷ 1.732 ≈ 240 V Current = 240 ÷ 25 = 9.6 A Result: Current = 9.6 A 5. Delta (Δ) Connection In a delta connection: Phase Voltage = Line Voltage Phase Current = Voltage ÷ Resistance Line Current = √3 × Phase Current Example: Phase Voltage = 415 V Resistance = 25 Ω Calculation: Phase Current = 415 ÷ 25 = 16.6 A Line Current = 1.732 × 16.6 ≈ 28.7 A Result: Line Current = 28.7 A Key Points Single-phase power: � Three-phase power: � In a Star (Y) connection, Phase Voltage = Line Voltage ÷ √3. In a Delta (Δ) connection, Phase Voltage = Line Voltage. Delta line current is √3 times the phase current, while in a Star connection, line current equals phase current. These formulas are commonly used for electrical installation, motor sizing, UPS systems, inverters, and industrial electrical calculations. #ElectronicsEducation #foryo #ElectronicsExplained #CircuitDesign #basicelectronics
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