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Diffstat (limited to '3871/CH10/EX10.21/Ex10_21.sce')
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1 files changed, 25 insertions, 0 deletions
diff --git a/3871/CH10/EX10.21/Ex10_21.sce b/3871/CH10/EX10.21/Ex10_21.sce new file mode 100644 index 000000000..e22cf06d5 --- /dev/null +++ b/3871/CH10/EX10.21/Ex10_21.sce @@ -0,0 +1,25 @@ +//===========================================================================
+//chapter 10 example 21
+clc;clear all;
+
+//variable declaration
+V1 = 450; //voltage in V
+V2 = 280; //voltage in V
+t = 15.2; //time in minutes
+t1 = 10.8; //time in minutes
+C = 2.5*10^-6; //capacitance in F
+
+//calculations
+t12 = t*60; //time in seconds
+t22 = t1*60; //time in seconds
+//V2 = V1*e^(t/C*R)
+x = V1/V2;
+y = log(x);
+R = t12/(C*y);
+R1 =t22/(C*y);
+//R1 = t1/(C*log(V1/V2));
+//1/R` = (1/R1)-(1/R)
+R11 = (R1*R)/(R-R1); //unknown resistance in Ω
+
+//result
+mprintf("unknown resistance= %3.2d M Ω",(R11*10^-6));
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