EngiRef / Electrical Engineering Formula
Ohm's Law
Ohm's Law: Voltage equals current times resistance. A DC Circuits formula in electrical engineering. Variables V, I and R, each with SI and imperial units.
DC Circuits
Specification
- Name
- Ohm's Law
- Discipline
- electrical
- Category
- DC Circuits
- LaTeX
- V = IR
- Description
- Voltage equals current times resistance
- Conditions
- Ohmic material at constant temperature
- Can solve for
- V, I, R
- Tags
- ohm, voltage, current, resistance
Variables
| Symbol | Name | Unit | Si Unit |
|---|---|---|---|
| V | Voltage | V | V |
| I | Current | A | A |
| R | Resistance | Ω | Ω |
Common questions
- What is the Ohm's Law formula?
- Voltage equals current times resistance. It sits under DC Circuits, Electrical engineering in the EngiRef reference.
- What do the symbols in the Ohm's Law formula mean?
- In Ohm's Law, V is voltage in V; I is current in A; R is resistance in Ω.
- When does the Ohm's Law formula apply?
- Ohm's Law holds under this condition: Ohmic material at constant temperature.