230 V · 8.696 A · 26.45 Ω · 2 kW
Voltage
230 V
Current
8.696 A
Resistance
26.45 Ω
Power
2 kW
Conductance
37.81 mS
Energy per day
2kWh
1 h of use
Cost per day
€0.50
Cost per year
€183
Heat produced
6,824BTU/h
all electrical power ends as heat
The 12 formulas
| Find | from V & I | from V & R / I & R | from P |
|---|---|---|---|
| V (volts) | — | V = I × R | V = P ÷ I · V = √(P × R) |
| I (amps) | — | I = V ÷ R | I = P ÷ V · I = √(P ÷ R) |
| R (ohms) | R = V ÷ I | — | R = V² ÷ P · R = P ÷ I² |
| P (watts) | P = V × I | P = V² ÷ R · P = I² × R | — |
- Valid for DC and for purely resistive AC loads (heaters, kettles, incandescent lamps). For motors and electronics on AC, real power = V × I × power factor, so use the kVA ↔ kW calculator.
- Resistance of metals rises with temperature: a cold tungsten filament has ~1/10 of its hot resistance, which causes inrush current.