Example 13 Figure 3.4 shows three lamps which consume 40, 60
and 100 W when connected to a 250 V supply. Calculate the
current, and the resistance of each lamp filament.
Total power consumed = 40 + 60 + 100 + 200 W
250/
= 200
200
/ = = 0.8 A
250
Ri R
2
#3
-250 V-
Figure
3.4
Since
l
2
R
x
= W,
W, 40
R)
—
—7 = —- = 62.5 O
I
2
0.8
2
I
2
R
2
= W
2
W
2
60
R
2
= -f = —- = 93.75 O
I
2
0.8
2
I
2
R
3
= W
3
100
^=^7 = ^ = 156.25 0
40
W
60
W
100 W
10 PRINT "PROG 3 8"
20 PRINT "THIS PROGRAM SOLVES EXAMPLE 13"
30 INPUT "ENTER INPUT VOLTAGE" : V
40 INPUT "WATTAGE OF Rl" : Wl
50 INPUT "WATTAGE OF R2" ; W2
60 INPUT "WATTAGE OF R3" ; W3
70
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