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solar cell & thermonuclear reactor

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Solution Summary

In first problem, using concept of current and energy relation, maximum power and efficiency of a solar cell are estimated. In second problem, using energy concept, kinetic energy of alpha particles and neutron are estimated.

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(d)
Area, A = 4 cm^2 == 4*10^(-4) m^2
Intensity of radiation, I = 1kW/m^2 == 1*10^3 W/m^2
Short circuit current, Isc= 160mA == 0.16 A
saturation current, Is = 4*10^(-9) mA == 4*10^(-12) A
V_T = 0.026 V

Because,
Ic = I_L - Is{exp(V/V_T) - 1}
I_L == Isc
For opencircuit, Ic = 0 and V = Voc
=> Voc = V_T * ln((Isc/Is) + 1)
=>Voc = 0.026*ln((0.16/(4*10^(-12))) + 1) = 0.6347 V --Answer

corresponding to V = 0.55 V
Ic = Isc - Is*(exp(V/V_T) - ...

Solution provided by:
Amrit Lal Ahuja, PhD (IP)
Education
  • BEng, Allahabad University, India
  • MSc , Pune University, India
  • PhD (IP), Pune University, India
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