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A lamp releases only light and thermal energy. The energy input of the lamp is 120 watts. Of that input, 80 watts is converted to light. How much energy is converted to thermal energy?
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A lamp releases only light and thermal energy. The energy input of the lamp is 120 watts. Of that input, 80 watts is converted to light. How much energy is converted to thermal energy?

User Webmat
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40 watts because 120-80 is forty or 80 + 40 - 120
User Shihab
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