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+// e be the charge of an electron e=-1.6*10^-19c
+ 
+// q be the charge, q=n*e where n is the no. of electrons
+ 
+// t is the time in seconds
+ 
+//i=q/t
+ 
+//i=(n*e)/t
+ 
+e=-1.6*10^-19;
+
+disp("e=")
+disp(e)
+// in coulombs C
+disp("C")
+ 
+n=10^15;
+
+disp(n)
+
+ 
+t=1;
+
+disp("t=")
+disp(t)
+// in seconds
+disp("sec")
+ 
+i=(n*e)/t;
+
+disp("i=")
+disp(i)
+// in amperes A
+disp("A")
+
+
+ 
+// i current is -0.00016A
+ 
+// power in watts P=V*I
+ 
+p=4;
+
+disp("p=")
+disp(p)
+// in watts W
+disp("W")
+
+ 
+ 
+v=p/i;
+
+disp("v=")
+disp(v)
+// in Volts V
+disp("V")
+
+ 
+// voltage needed to accelerate electron beam to 4w is 25000V
+ 
+V/1000;
+
+disp("V=")
+disp(V/1000)
+disp("KV")
+  
+ 
+// V is 25Kv
+