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प्रश्न
What is electric power?
टीपा लिहा
उत्तर
It is the rate at which an electric appliance converts electric energy into other forms of energy. Or, it is the rate at which work is done by a source of emf in maintaining an electric current through a circuit.
P = `"W"/"t" = "VI" = "I"^2"R" = "V"^2/"R"`
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Energy and Power in Electrical Circuits
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संबंधित प्रश्न
What is electric energy?
Derive the expression for power P = VI in electrical circuit.
Write down the various forms of expression for power 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.
