Ohm, power and energy — I, P, R and kWh
P = U · I · cos φ (single-phase), P = √3 · U · I · cos φ (three-phase), kWh = P × hours. Pick what you want to find and type the rest.
Limits and citations come from the app's pack files. The calculator below is checked against the app's engine on every build · engine 1.
The same job in the app
2000 W at 230 V: 8.7 A, 26.4 Ω, 6.0 kWh per day.
How it's calculated
Single-phase and DC: P = U · I · cos φ, so I = P / (U · cos φ). Three-phase: P = √3 · U · I · cos φ with U the line-to-line voltage. Resistance is R = U / I, and energy is the power multiplied by the hours it runs.
The power factor only matters on AC.
Worked example
2000 W at 230 V, cos φ 1: 8.7 A; 26.4 Ω; 6 kWh per day at 3 hours.
What this does not check. Anything against a rule — there is no verdict on this screen. Lastsocket is a design aid. It does not replace the applicable installation standard, manufacturer data, or a qualified person’s judgement. Sources and limits →
Free or Pro. Free. Nothing on this screen is looked up.