Four resistors of 20 Ω, 40 Ω, 60 Ω, and 80 Ω are connected across a DC voltage source. If the current through this circuit is 0.5 A, what is the voltage applied to this circuit?
A) 20 V
B) 40 V
C) 60 V
D) 80 V
E) 100 V

Question

Quizplus · Accepted Answer

The resistors are in series, so the total resistance is 20 + 40 + 60 + 80 = 200 Ω. Using Ohm's Law (V = IR), the voltage is 0.5 A * 200 Ω = 100 V.

Four Resistors of 20 Ω, 40 Ω, 60 Ω, and 80