A 20 Ω resistor is connected to an AC power supply with a voltage output that varies from 4V to –2V at equal time intervals as shown on the graph below. What is the average heating power dissipated in the resistor?
[Figure: Graph showing voltage vs time, with voltage alternating between 4V (0.0-0.1s, 0.2-0.3s) and -2V (0.1-0.2s, 0.3-0.4s)]
A. 0.2W
B. 0.5W
C. 0.8W
D. 1.0W