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Newnes Circuit Calculations Pocket Book
book

Newnes Circuit Calculations Pocket Book

by Thomas J. Davies
April 2016
Intermediate to advanced content levelIntermediate to advanced
384 pages
12h 56m
English
Newnes
Content preview from Newnes Circuit Calculations Pocket Book
34
Circuit calculations pocket book
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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Publisher Resources

ISBN: 9781483101132