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IEVref: | 131-11-30 | ID: | |

Language: | en | Status: Standard | |

Term: | instantaneous power | ||

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Symbol: | p
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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 A Note 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 | ||

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$p={u}_{\mathrm{AB}}\cdot i$

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 A

Note 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.