1) Single Phase Power Used in homes and small loads. Formula: � Where: P = Power (Watt) V = Voltage I = Current (Ampere) Example: Voltage = 230V Current = 5A Calculation: Power = 230 × 5 = 1150W Meaning: If a device uses 5A on 230V supply, it consumes 1150 watts. 2) Three Phase Power Used in factories, motors, and big machines. Formula: � Where: √3 = 1.732 V = Line Voltage I = Line Current PF = Power Factor Example: V = 415V I = 15A PF = 0.8 Result: Power ≈ 8.63 kW Meaning: Three-phase systems can deliver more power efficiently. 3) Three Phase Motor Current This formula finds motor current. Formula: � Where: P = Power in watts V = Voltage PF = Power Factor η = Efficiency Example: P = 11000W V = 415V PF = 0.85 η = 0.9 Current: 20.5A Meaning: An 11kW motor on 415V takes about 20.5 amps. 4) Star (Y) Connection In Star connection: Formula: � Phase voltage becomes lower. Line current = Phase current. Example: Line Voltage = 415V Resistance = 25Ω Results: Phase Voltage ≈ 240V Current ≈ 9.6A Meaning: Star connection gives lower starting current and safer motor starting. 5) Delta (D) Connection In Delta connection: Phase voltage = Line voltage Line current becomes higher. Formula: � Example: Voltage = 415V Resistance = 25Ω Results: Phase Current = 16.6A Line Current = 28.7A Meaning: Delta connection gives higher torque and more power. Simple Difference System Use Single Phase Home appliances Three Phase Motors & industries Star (Y) Low starting current Delta (D) High power operation #ElectronicsEducation #ElectronicsExplained #foryou #basicelectronics #CircuitDesign - @electroniceducation