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Question
Derive the expression for power P = VI in electrical circuit.
Short Note
Solution
The electrical power P is the rate at which the electrical potential energy is delivered,
P = `"dU"/"dt" = "d"/"dt" ("V" * "dQ") = "V""dQ"/"dt"`
Since the electric current I = `"dQ"/"dt"`
So the equation can be rewritten as P = VI.
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Energy and Power in Electrical Circuits
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