What is the formula for the electric power system?
GeneralClass 12AllAnswered 27 Mar 2026
Answer
For comprehensive power system analysis, multiple formulas are used depending on the system type:
Single-phase systems:
- P = V × I × PF (with power factor)
- P = V × I (for DC or unity power factor AC)
Three-phase systems:
- P = √3 × VL × IL × PF (line values)
- P = 3 × Vph × Iph × PF (phase values)
Energy calculation:
- E = P × t (Energy = Power × time)
- kWh = (kW × hours)
The specific formula depends on whether you're analyzing DC circuits, single-phase AC, three-phase AC, and whether you need real power (W), reactive power (VAR), or apparent power (VA).
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