A. How much voltage does the light bulb uses up? How do you measure this value?

Question

A. How much voltage does the light bulb uses up? How do you measure this value?

B. What is the change in the potential energy of a single electron as it moves through the light bulb?

C. Is this a gain or loss of potential energy?

D. Where in the light bulb do you think this gain or loss occurs? Explain your reasoning

How much voltage does the light bulb uses up? How do you measure this value? What is the change in the potential energy of a single electron as it moves through the light bulb? Is this a gain or loss of potential energy? Where in the light bulb do you think this gain or loss occurs? Explain your reasoning

Explanation / Answer

A. THE LIGHT BULB USES 1.15-0.2 =0.95V...SIMPLY THE DIFFERENCE ACROSS THE TWO TERMINALS....

B.THE CHANGE IN PE OF A SINGLE ELECTRON IS TOO 0.95...IN FACT EACH ELECTRON HAS THE SAME VOLTAGE DROP..

C.THERE IS A LOSS OF P.E. IN THE FORM OF OTHER FORMS OF ENERGY LIKE LIGHT,HEAT ETC..

D.thE LOSS OF ENERGY OCCURS IN THE TUNGSTEN MADE FILAMENT OF BULB...THE FILAMENT HEATS UP RESULTING IN HEAT LOSS AND EMISSION OF LIGHT TOO,INDICATING LIGHT ENERGY LOSS

NOTE...THE OTHER PARAMETERS IN THE FIGURE ARE JUST TO CONFUSE THE STUDENT...WHAT MATTERS IS THE DROP ACROSS BULB

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