As a design engineer, you are asked to design a lighting system consisting of a 70-W power supply and two light bulbs as shown in Fig. 2.124. You must select the two bulbs from the following three available bulbs. R 1 = 80 Ω , cost = $ 0.60 ( standard size ) R 2 = 90 Ω , cost = $ 0.90 ( standard size ) R 3 = 100 Ω , cost = $ 0.75 ( nonstandard size ) The system should be designed for minimum cost such that I lies within the range I = 1.2 A ± 5 percent. Figure 2.124
As a design engineer, you are asked to design a lighting system consisting of a 70-W power supply and two light bulbs as shown in Fig. 2.124. You must select the two bulbs from the following three available bulbs. R 1 = 80 Ω , cost = $ 0.60 ( standard size ) R 2 = 90 Ω , cost = $ 0.90 ( standard size ) R 3 = 100 Ω , cost = $ 0.75 ( nonstandard size ) The system should be designed for minimum cost such that I lies within the range I = 1.2 A ± 5 percent. Figure 2.124
Solution Summary: The author explains how to select two bulbs in three available bulbs, such that system should be designed for minimum cost and current range.
As a design engineer, you are asked to design a lighting system consisting of a 70-W power supply and two light bulbs as shown in Fig. 2.124. You must select the two bulbs from the following three available bulbs.
R
1
=
80
Ω
,
cost
=
$
0.60
(
standard
size
)
R
2
=
90
Ω
,
cost
=
$
0.90
(
standard
size
)
R
3
=
100
Ω
,
cost
=
$
0.75
(
nonstandard
size
)
The system should be designed for minimum cost such that I lies within the range I = 1.2 A ± 5 percent.
Resistors Circuits I
Each of the circuits below consists of a battery and several resistors. Several of the voltages, currents, and resistances are indicated. Use both of Kirchoff's Laws and Ohm's Law to determine as many of the other voltages, currents, and resistances as possible.
2a- Please I want a solution of all sub-part questions in details by typing them. Thanks
For the circuit shown below, an ammeter connected across the output of the black box reads .04A while a voltmeter connected across the same two points reads 6V. Determine the equivalent Thevenin resistance and voltage as seen between those points.
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