Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Engineering
Ohm's Law Calculator
Calculate electrical resistance from voltage and current using Ohm's Law: R = V / I. Use it for circuit analysis, troubleshooting electronic circuits, or sizing resistors and conductors in DC and AC (resistive) systems.
Fill in the required fields to see your result.
Electrical
Electrical Power Calculator
Calculates electrical power in watts from voltage and current using P = V × I. Used by electricians, engineers, and DIYers to size fuses, cables, power supplies, and estimate appliance energy use.
Fill in the required fields to see your result.
Key differences
| Ohm's Law Calculator | Electrical Power Calculator | |
|---|---|---|
| Category | Engineering | Electrical |
| Inputs required | 2 | 2 |
| Result | Resistance (Ω) | Power (W) |
| What it does | Calculate electrical resistance from voltage and current using Ohm's Law: R = V / I. Use it for circuit analysis, troubleshooting electronic circuits, or sizing resistors and conductors in DC and AC (resistive) systems. | Calculates electrical power in watts from voltage and current using P = V × I. Used by electricians, engineers, and DIYers to size fuses, cables, power supplies, and estimate appliance energy use. |