Ohm’s Law Calculator (resistance & power)
Enter voltage and current to get resistance (ohms) and power (watts) instantly. For electricians and students.
Quick answer
230 V, 5 A: 46 Ω, power 1,150 W.
How it is calculated
- Ohm’s law: V = I × R, so R = V ÷ I = 230 ÷ 5 = 46 Ω.
- Power P = V × I = 230 × 5 = 1,150 W.
- Other forms: P = I² × R = V² ÷ R.
Worked example
5 amps at 230 volts: resistance 46 Ω and power 1,150 W.
| Voltage | 230 V |
| Current | 5 A |
| Resistance | 46 Ω |
| Power | 1,150 W |
Formula
Resistance = Vv/Ia Power = Vv×Ia
Good to know
- For AC loads like motors the power factor also matters; this is the simple resistive case.
- Size the MCB a little above the load current.
Questions people ask
What is Ohm’s law?
Voltage = current × resistance (V = IR).
Current drawn by a 1,500 W heater at 230 V?
1,500 ÷ 230 ≈ 6.5 A.
How do I find power?
Voltage × current.
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Updated 13 Nov 2026 · Desktop N Calculator v1.2.0