Watts to Ohms Calculator
Heating element coil fabrication, vape wire coil resistance, dummy load sizing. Finds the required internal resistance for a target wattage rating at specific voltage/current.
Step-by-Step Derivation ▼ Show Steps
Calculations adhere to standard electrical equations and National Electrical Code guidelines.
Engineering Principles & Calculations
This calculator uses the exact mathematical relationships between Power (W), Voltage (V) or Current (A) to determine Resistance (Ohms / Ω). In practical applications, electrical systems must account for safety derating factors, nominal vs actual voltages, and conductor resistance losses.
Finds the required internal resistance for a target wattage rating at specific voltage/current.
Typical Application & Best Practices
Heating element coil fabrication, vape wire coil resistance, dummy load sizing.
Watts to Ohms Calculator Benchmark Lookup Table
| Target Wattage | Supply Voltage | Required Resistance | Current Draw |
|---|---|---|---|
| 100 W | 12V DC | 1.44 Ohms | 8.33 A |
| 500 W | 120V AC | 28.80 Ohms | 4.17 A |
| 1000 W | 120V AC | 14.40 Ohms | 8.33 A |
| 1500 W | 120V AC | 9.60 Ohms | 12.50 A |
| 3000 W | 240V AC | 19.20 Ohms | 12.50 A |
| 4500 W | 240V AC | 12.80 Ohms | 18.75 A |