EngiRef / Electrical Engineering Formula
Electrical Power (I²R)
Electrical Power (I²R): Power dissipated in a resistance. A DC Circuits formula in electrical engineering. Variables P, I and R, each with SI and imperial…
DC Circuits
Specification
- Name
- Electrical Power (I²R)
- Discipline
- electrical
- Category
- DC Circuits
- LaTeX
- P = I^2R
- Description
- Power dissipated in a resistance
- Conditions
- Resistive element; DC or RMS for sinusoidal AC
- Can solve for
- P, I, R
- Tags
- power, current, resistance, joule
Variables
| Symbol | Name | Unit | Si Unit |
|---|---|---|---|
| P | Power | W | W |
| I | Current | A | A |
| R | Resistance | Ω | Ω |
Common questions
- What is the Electrical Power (I²R) formula?
- Power dissipated in a resistance. It sits under DC Circuits, Electrical engineering in the EngiRef reference.
- What do the symbols in the Electrical Power (I²R) formula mean?
- In Electrical Power (I²R), P is power in W; I is current in A; R is resistance in Ω.
- When does the Electrical Power (I²R) formula apply?
- Electrical Power (I²R) holds under this condition: Resistive element; DC or RMS for sinusoidal AC.