The Sankey diagrams below show the energy transfers in two light bulbs. How much energy is wasted by light bulb 2?

The amount of energy wasted by light bulb 2 = 70 J

Explanation:

Sankey diagrams are used to graphically indicate the proportional flow rate of a quantity

The labelled Sankey diagrams, here, indicate the energy transfers in two light bulbs, light bulb 1 and light bulb 2

From the labelled Sankey diagrams, we have;

For light bulb 1, the input energy = 80 J

The useful energy = 40 J

The wasted energy = 80 - 40 = 40 J

For  light bulb 2, the input energy = 80 J

The useful energy = 10 J

Therefore, the wasted energy = 80 - 10 = 70 J

The amount of energy wasted by light bulb 2 = 70 J.

70 Joules of energy is wasted by light bulb 2 whereas bulb 1 wasted 40 joules of energy.

Bulb 1 uses 40 joules of energy out of 80 joules of energy and 40 joules of energy are wasted out of 80 joules of energy while on the other hand, bulb 2 uses 10 joules of energy as useful energy and 70 joules of energy are wasted out of 80 joules of energy.

According to the image, bulb 2 wasted more energy than bulb 1 so we can conclude that 70 joules of energy is wasted by bulb 2 out of 80 joules of energy.

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