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The image displays the coal in the power plant on left which emits energy through transmission lines, which are displayed in the form of antenna towers in the middle. The transmission lines are connected to the right part that displays a lightened bulb labeled, light. Power plant is labeled E sub 1 equals 0.35. Transmission lines are labeled, E sub 2 equals 0.92. Light is labeled, E sub 3 equals 0.024. Overall efficiency for conversion of chemical energy to light energy is E sub 1 multiplied by E sub 2 multiplied by E sub 3 equals 0.35 multiplied by 0.92 multiplied by 0.024 equals 0.8 percent.