Convert between Volts, Watts, Amps, and Ohms using Ohm's Law. V = I x R (Voltage = Current x Resistance). P = V x I (Power = Voltage x Current). Example: a 100W bulb at 230V draws 100/230 = 0.43 Amps. Sri Lanka and UK use 230V/50Hz. USA uses 110V/60Hz. This affects which appliances work internationally.
📂 Converters
⚡ Voltage & Power Converter
Convert between volts, watts, amps, and ohms using Ohm's Law. Calculate power, current, voltage, and resistance for electrical circuits and appliances.
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🦉Owl's Explanation
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Fill in the values above and click Calculate ✨
✅ Trusted Tool
Uses standard Ohm's Law formulas. Free for electricians, students, and DIY enthusiasts. No sign-up needed.
🤔 How Does This Work?
P = V × I (Power = Voltage × Current)
I = P / V (Current = Power / Voltage)
V = P / I (Voltage = Power / Current)
R = V / I (Resistance = Voltage / Current)
❓ Frequently Asked Questions
What is Ohm's Law?▼
Ohm's Law describes the relationship between voltage, current, and resistance: V = I x R. Where V = Voltage (volts), I = Current (amperes/amps), R = Resistance (ohms). From this: Power P = V x I = I² x R = V²/R. These four formulas let you calculate any electrical value if you know two others.
What voltage does Sri Lanka use?▼
Sri Lanka uses 230V/50Hz — same as UK, India, Europe, and Australia. The USA uses 110V/60Hz. Appliances from 110V countries (USA, Canada, Japan) need a voltage converter to work in Sri Lanka. Modern laptop chargers and phone chargers typically work on both 100-240V (check the label). Always verify before plugging in.
Ohm's Law describes the relationship between voltage, current, and resistance: V = I x R. Where V = Voltage (volts), I = Current (amperes/amps), R = Resistance (ohms). From this: Power P = V x I = I² x R = V²/R. These four formulas let you calculate any electrical value if you know two others.
What voltage does Sri Lanka use?▼
Sri Lanka uses 230V/50Hz — same as UK, India, Europe, and Australia. The USA uses 110V/60Hz. Appliances from 110V countries (USA, Canada, Japan) need a voltage converter to work in Sri Lanka. Modern laptop chargers and phone chargers typically work on both 100-240V (check the label). Always verify before plugging in.