IEVref: 131-11-30 ID: Language: en Status: Standard Term: instantaneous power Synonym1: Synonym2: Synonym3: Symbol: p Definition: for a two-terminal element or a two-terminal circuit with terminals A and B, product of the voltage ${u}_{\mathrm{AB}}$ between the terminals and the electric current i in the element or circuit $p={u}_{\mathrm{AB}}\cdot i$ where ${u}_{\mathrm{AB}}$ is the line integral of the electric field strength from A to B, and where the electric current in the element or circuit is taken positive if its direction is from A to B and negative if its direction is from B to ANote 1 to entry: The direction of electric current is as defined in 131-11-29. Note 2 to entry: In circuit theory the electric field strength is generally irrotational and thus ${u}_{\mathrm{AB}}={v}_{\mathrm{A}}-{v}_{\mathrm{B}}$, where ${v}_{\mathrm{A}}$ and ${v}_{B}$ are the electric potentials at terminals A and B, respectively. Note 3 to entry: The coherent SI unit of instantaneous power is watt, W. Publication date: 2013-08 Source: Replaces: Internal notes: CO remarks: TC/SC remarks: VT remarks: Domain1: Domain2: Domain3: Domain4: Domain5: