Formula
Ohm's law for resistance is:
Ohms = volts / amperes
The electrical-power page uses voltage and resistance to get watts. This page stops at ohms.
Assumptions
- Current is greater than zero.
- The component follows Ohm's law.
Worked example
12 V at 2 A is 6 Ω.
Input definitions
- Voltage
- The potential difference, in volts.
- Current
- The current, in amperes.
Limitations
This is a classroom calculation. It is not a laboratory procedure, a wiring plan, or a measured instrument reading.
Questions
Can current be zero?
No. An open path has no current to divide by on this page.
Does this color-code a resistor?
No. It only divides the voltage by the current.