Ohm's Law Resistance
Use voltage and current to calculate resistance R=V/I.
How to use
- Enter voltage V.
- Enter a non-zero current I and calculate.
Capabilities and scope
The ratio of measured voltage to current represents resistance at that operating point.
How it works
It uses R=V/I.
Example
V=9 V and I=0.3 A give R=30 Ω.
Useful for
- Back-calculate resistance from measured V and I
- Verify an Ohm's-law relationship
Before you use it
- No finite result exists at I=0, and nonlinear devices can have operating-point-dependent resistance.
Frequently asked questions
Is the result always a physical resistor value?
No. It is the equivalent V/I ratio for the entered operating point.