Four resistors are connected in series across an 18 V source. Three resistors drop 0 V and one resistor drops 18 V. Whatʹs the trouble?
A)The three resistors are open.
B)One resistor is open.
C)Two of the resistors are shorted.
D)There is no trouble; theseVoltages are normal.

Question

Quizplus · Accepted Answer

In a series circuit, the voltage drop across each resistor should add up to the total voltage of the source. In this case, three resistors dropping 0 V means that there is no current flowing through them, which indicates that one of the resistors must be open (not allowing current to pass through). Therefore, the trouble is that one resistor is open, and the answer is choice B.

Four Resistors Are Connected in Series Across an 18 V