Passage IV
Figure 1 is a diagram of an RLC circuit. The circuit has a power supply and 3 components: a resistor (R), an inductor (L), and a capacitor (C).
Electric current can flow through the circuit either clockwise (positive current) or counterclockwise (negative current). Figure 2 shows how the electric current in the circuit, I (in amperes, A), and the power supply voltage, Vs (in volts, V), both changed during a 20-millisecond (msec) time interval.
Figure 3 shows how the voltages across the components—VR, VL, and VC, respectively—each changed during the same 20 msec time interval.
23. According to Figures 2 and 3, which voltage varied the least during the 20 msec interval?
Your Answer is
Correct Answer is C
Explanation
Look at the ordinate voltage in figure 2 and figure 3, the waveform with the smallest value range corresponds to VL, ±50V