Discussion
A 50 Ω resistor is connected in series with a 100 Ω resistor. What will be the effective resistance of the series connection?
Answer: D
The effective resistance is 150 Ω. In a series connection the resistances add.
\[ R = 50 + 100 = 150\ \Omega \]
The values 25 Ω, 50 Ω and 100 Ω are not the sum of 50 Ω and 100 Ω, and 100 Ω is simply one of the two resistors. None of these is the total resistance, so the fourth option is the answer. In a parallel connection the total would be less than the smallest resistor, which is not the case here.
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