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OpenStudy (anonymous):

How much energy does a 50 watt light bulb used to compare to 100 watt light bulb if both are shining for the same length of time . please explain

OpenStudy (anonymous):

Energy is given by:\[E=Pt\]where E is energy; P is power; and t is time. If there are two bulbs--one with twice the power rating (100W) vs the other (50W)--and they shine for the same amount of time, then by the equation above the bulb with twice the power has to expend twice the energy.

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