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Electric Power

What determin...

Question

What determines the rate at which energy is delivered by a current?

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Solution

The rate of consumption of electric energy in an electric appliance is called electric power. Hence, the rate at which energy is delivered by a current is the power of the appliance.

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Q. Question 1
What determines the rate at which energy is delivered by a current?

Q. The physical quantity that determines the rate at which energy is delivered by an electric current is

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inductor is placed in series with a

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is then suddenly applied across the

R L

combination. At

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after the emf is applied what is the rate at which energy is being delivered by the battery?

Q. A capacitor of capacitance 12.0 μF is connected to a battery of emf 6.00 V and internal resistance 1.00 Ω through resistanceless leads. 12.0 μs after the connections are made, what will be (a) the current in the circuit (b) the power delivered by the battery (c) the power dissipated in heat and (d) the rate at which the energy stored in the capacitor is increasing?

Q. An inductor of inductance 2.00 H is joined in series with a resistor of resistance 200 Ω and a battery of emf 2.00 V. At t = 10 ms, find (a) the current in the circuit, (b) the power delivered by the battery, (c) the power dissipated in heating the resistor and (d) the rate at which energy is being stored in magnetic field.

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