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Question
Write down the various forms of expression for power in electrical circuit.
Solution
The electric power P is the rate at which the electrical potential energy is delivered,
P = `"dU"/"dt" = 1/"dt" ("V"*"dQ") = "V"*"dQ"/"dt"`
[dU = V.dQ]
The electric power delivered by the battery to any electrical system.
P = VI
The electric power delivered to the resistance R is expressed in other forms.
P = VI = I(IR) = I2R
P = IV = `("V"/"R") "V" = "V"^2/"R"`.
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Derive the expression for power P = VI in electrical circuit.
Four light bulbs P, Q, R, S are connected in a circuit of unknown arrangement. When each bulb is removed one at a time and replaced, the following behavior is observed.
| P | Q | R | S | |
| P removed | * | on | on | on |
| Q removed | on | * | on | off |
| R removed | off | off | * | off |
| S removed | on | off | on | * |
Draw the circuit diagram for these bulbs.
