A solar cell generates a potential difference of 0.1667 V when a 500 resistor is

Question

A solar cell generates a potential difference of 0.1667 V when a 500 resistor is connected across it, and a potential difference of 0.2432 V when a 1000 resistor is substituted. What is the internal resistance of the solar cell? Submit Answer Tries 0/99 What is the emf of the solar cell? Submit Answer Tries 0/99 The area of the cell is 5.0 cm2, and the rate per unit area at which it receives energy from light is 2.0m W/ cm2. What is the efficiency of the cell for converting the light energy to thermal energy in the 1000 external resistor? (percent = Do not enter a unit)

Explanation / Answer

V1 = 0.1667 Volts

R1 = 500 ohm,

E = emf

r = internal resistance

V1 = E - i1 r

0.1667 = E - (0.1667/500) r

E = 0.1667 + (0.1667/500) r                            eq-1

V2 = E - i2 r

0.2432 = E - (0.2432/1000) r

using eq-1

0.2432 = (0.1667 + (0.1667/500) r  ) - (0.2432/1000) r

r = 848.12 ohm

using eq-1

E = 0.1667 + (0.1667/500) r

E = 0.1667 + (0.1667/500) (848.12)

E = 0.45 volts

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