The voltage supplied by a wall socket varies with time, reversing its polarity with a constant frequency, as shown in the graph. (Figure 1)
a) What is the rms value Vrms of the voltage plotted in the graph? Express your answer in volts.
b) When a lamp is connected to a wall plug, the resulting circuit can be represented with a simplified AC circuit, as shown in the figure.(Figure 2) Here the lamp has been replaced with a resistor with an equivalent resistance R = 120? . What is the rms value Irms of the current flowing during the circuit? Express your answer in amperes.
c) What is the average power Pavg dissipated in the resistor? Express your answer in watts.