1. A solar cell generates a potential difference of0.0806 V when a 500 resistor

Question

1. A solar cell generates a potential difference of0.0806 V when a 500 resistor is connected acrossit, and a potential difference of 0.1241 V when a 1000 resistor is substituted. What is the internal resistance ofthe solar cell? 2. What is the emf of the solarcell? 3. The area of the cell is 5.0cm2, and the rate per unit area at which itreceives energy from light is 2.0m W/cm2. What is the efficiency of the cell forconverting the light energy to thermal energy in the 1000 external resistor? (percent = Do not enter a unit) 1. A solar cell generates a potential difference of0.0806 V when a 500 resistor is connected acrossit, and a potential difference of 0.1241 V when a 1000 resistor is substituted. What is the internal resistance ofthe solar cell? 2. What is the emf of the solarcell? 3. The area of the cell is 5.0cm2, and the rate per unit area at which itreceives energy from light is 2.0m W/cm2. What is the efficiency of the cell forconverting the light energy to thermal energy in the 1000 external resistor? (percent = Do not enter a unit)

Explanation / Answer

if emf is E and internal resistance is r, E - rI = RI for R = 500, V = RI = .0806, so I = .0806/500 E - r(.0806/500) = .0806 for R = 1000, V = RI = .1241, so I = .1241/1000 E - r(.1241/1000) = .1241 subtracting, r(.1241/1000) - r(.0806/500) = .0806-.1241 r = (.0806-.1241)/[(.1241/1000) - (.0806/500)] =1172.51 E = (r+R)I = (1172.51+500)(.0806/500) = .27 V

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