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resistor is an electric component which is used for the purpose to restrict the electron flow. if you run with 10Km/hour speed now i will stop you is it possible to stop you suddenly. No it is not possible. so that resistor dissipate some energy in the form of heat.

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It "runs out" when it reaches thermal equilibrium with it's environment. In that case, as @Kevin points out, the dissipation equals the absorption from the environment. If you pass a current through the resistor, it will heat up and that will drive extra current/voltage noise in the resistor. FYI: Resistive cooling of ions in a Penning trap uses a cooled ...

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It works just like every other kind of thermal energy. If a resistor can give out energy to the environment, it can also receive it. For example, if it gives it out by radiating, it can also absorb radiation; if it gives it out by having its fast-moving atoms smash into air molecules, then fast-moving air molecules can also smash into it. When it's in ...

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The lightnings primarily depend on strong electrostatic fields. They're up to 100 volts per meter in the summer and 500 volts per meter in the winter. These fields are fluctuating. When a certain critical threshold not far from those values is reached, a lightning strikes. Does the electrostatic field move a metal? There is no direct electrostatic force ...

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Both equations are valid. You just made an error in taking suddenly 20 $\Omega$ instead of 40 $\Omega$. $$P = I^2 \cdot R = 25 A^2 \cdot 40 \Omega = 1 kW$$ $$P = U^2 / R = 40000 V^2 / 40\Omega = 1 kW$$ The power is always determind by the current that runs through the part of interest times the voltage drop over it. If there are other parts in a ...

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