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Any component in an electrical circuit dissipates energy in the form of heat, light, sound, etc. For a lightbulb, it is desirable that the entire energy be converted to light energy. But, this is not the case as a part of the energy is lost as heat.
The rate of dissipation of energy. If the energy dissipated in time t is E, then the power P is defined as,
Efficiency is defined as the fraction or percentage of the total power that is converted into light energy.
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