Skip to main content
ElecToolsHQ

Single Phase Examples

These worked examples apply the single-phase power formula (P = V × I × PF) and its variants to find power, current, and apparent power.

  1. Step 1

    A single-phase load draws 10 A at 120 V with a power factor of 0.9. Find the real power.

    P = V × I × PF = 120 × 10 × 0.9 = 1080 W

  2. Step 2

    A single-phase load is rated at 1200 W, 120 V, with a power factor of 0.9. Find the current.

    I = P ÷ (V × PF) = 1200 ÷ (120 × 0.9) ≈ 11.1 A

  3. Step 3

    A single-phase circuit carries 10 A at 120 V. Find the apparent power.

    kVA = (V × I) ÷ 1000 = (120 × 10) ÷ 1000 = 1.2 kVA

Related