Series/Parallel Circuits: Four resistors having resistances of 20 ?, 40 ?, 60 ?, and 80 ? are connected in series across an ideal dc voltage source. If the current through this circuit is 0.50 A, what is the voltage of the voltage source?
A. 20 V
B. 40 V
C. 60 V
D. 80 V
E. 100 V
Answer: E
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