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Expression for power.

A diagram shows a rectangle with two terminals marked as 1 and 2 at its
ends. Positive voltage is indicated as v, with polarities at 1 and 2 marked as
plus and minus, respectively. A right-facing arrow pointing at terminal 1, and
labeled as i, represents positive current in the circuit. Power in the circuit is
represented as "p = vi".

A diagram shows a rectangle with two terminals marked as 1 and 2 at its
ends. Positive voltage is indicated as v, with polarities at 1 and 2 marked as
plus and minus, respectively. A left facing arrow pointing at terminal 2, and
labeled as i, represents negative current in circuit. Power in the circuit is
represented as "p = minus vi".

A diagram shows a rectangle with two terminals marked as 1 and 2 at its
ends. Negative voltage is indicated as v, with polarities at 1 and 2 marked as
minus and plus, respectively. A right-facing arrow pointing at terminal 1, and
labeled as i, represents positive current in the circuit. Power in the circuit is
represented as "p = minus vi".

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