Wasted energy Not all energy is changed into the type we want.

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Presentation transcript:

Wasted energy Not all energy is changed into the type we want

Identify the useful and wasted energy

What is the difference between the energy transformation in these two bulbs? Which might be the most efficient (waste the leave energy) ?

Measure the electrical energy going into each of these bulbs. Use this information to calculate the efficiency of each bulb Filament bulbLow energy bulb Electrical energy entering each bulb Light energy emitted6W5W Heat energy emitted50W6W

Plenary

Phone chargerLight bulb Electrical energy in (W)1W60W Energy out (W) Heat 0.2 W Electrical 0.8W Light 6W Heat 54W Which of these is most efficient?