Suppose a 1-KΩ resistor will dissipate 1.05 W, and you have many 1-W resistors of all common values.
If there’s room for 20-percent resistance error, the cheapest solution is to use:
A. Four 1 KΩ, 1-W resistors in series-parallel.
B. Two 2.2 KΩ, 1-W resistors in parallel.
C. Three 3.3 KΩ, 1-W resistors in parallel.
D. One 1 KΩ, 1-W resistor, since manufacturers allow for a 10-percent margin
of safety.
Show Answer
Answer: B
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