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.
24. Polarity refers to whether a voltage is positive or negative (a voltage of 0 V has no polarity and can be ignored). Based on Figures 2 and 3, which 2 voltages were always opposite in polarity?
Your Answer is
Correct Answer is H
Explanation
Look at figure 3, the abscissa of the two points of intersection of the two waves VL and VC are both 0, when the abscissa is the same, the voltage of the two waves is always one positive and one negative