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// A Texbook on POWER SYSTEM ENGINEERING
// A.Chakrabarti, M.L.Soni, P.V.Gupta, U.S.Bhatnagar
// DHANPAT RAI & Co.
// SECOND EDITION
// PART IV : UTILIZATION AND TRACTION
// CHAPTER 4: ILLUMINATION
// EXAMPLE : 4.5 :
// Page number 754
clear ; clc ; close ; // Clear the work space and console
// Given data
flux = 900.0 // Lamp emitting light(lumens)
D = 30.5 // Diameter of globe(cm)
B = 250.0*10**-3 // Uniform brightness(Ambert)
// Calculations
cp = %pi/4*D**2*(B/%pi) // Candle power
flux_emit = cp*4*%pi // Flux emitted by globe(lumens)
flux_abs = flux-flux_emit // Flux absorbed by globe(lumens)
light_abs_per = flux_abs/flux*100 // Light absorbed(%)
// Results
disp("PART IV - EXAMPLE : 4.5 : SOLUTION :-")
printf("\ncp of the globe = %.f ", cp)
printf("\nPercentage of light emitted by lamp that is absorbed by the globe = %.1f percent\n", light_abs_per)
printf("\nNOTE: Changes in the obtained answer from that of textbook is due to more precision here & approximation in textbook solution")
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