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This question is a little vague, but I think you're wondering where the energy from the battery goes when you turn the light on. The energy in the battery is used to create an electric current in the light bulb. This heats the filament in the bulb, energizing the atoms within. The atoms are more stable when they are not energized than when they are, so they will quickly lose the energy from the current (they will quickly be energized again, of course). The lost energy is ejected from the atom in the form of a photon, which exits the bulb as light. So, ultimately, the energy is transferred into the electromagnetic waves of the light.

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15y ago

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