If a 60 W light bulb in a bedside desk lamp is just 20% efficient and converting electric energy right into light energy, how numerous joules that light energy does this irradiate bulb produce every minute?
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The formula to calculation the total variety of Joules of power by the light bulb is together follows:

E (Joules) = p (Watts) X t (seconds)

E = 60 W X 60 seconds

E = 3600 Joules that energy

The full amount of power generated by the light pear every...

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The formula to calculation the total number of Joules of energy by the light pear is as follows:

E (Joules) = p (Watts) X t (seconds)

E = 60 W X 60 seconds

E = 3600 Joules of energy

The total amount of energy generated through the light bulb every minute is 3600 Joules. If the light pear is only twenty (20) percent efficient in converting that power to visible light energy, that would certainly be twenty percent of the total.

3600 Joules time .2 = 720 Joules

Of the full energy, 3600 Joules, only 720 Joules is converted to visible light energy. Old fashioned, incandescent bulbs with filaments to be notoriously inefficient, converting much of their power in the type of warmth energy. Just a small section of their energy was invested for what it to be designed for, clearly shows light. More recent bulb designs use more energy because that visible light and also spend less power on heat, making their use more efficient.

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