Power in AC Circuits Video Lessons

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Problem: What is the rms value Vrms of the voltage plotted in the graph?Part BWhen a lamp is connected to a wall plug, the resulting circuit can be represented by a simplified AC circuit, as shown in the figure. Here the lamp has been replaced by a resistor with an equivalent resistance R = 120 Ω. What is the rmsvalue Irms of the current flowing through the circuit?What is the average power Pavg dissipated in the resistor?

FREE Expert Solution

Part A

Root mean square voltage,

Vrms=Vpeak2

Irms=VrmsR

Pavg=VrmsIrms

Vpeak = 170 V

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Problem Details

What is the rms value Vrms of the voltage plotted in the graph?


Part B

When a lamp is connected to a wall plug, the resulting circuit can be represented by a simplified AC circuit, as shown in the figure. Here the lamp has been replaced by a resistor with an equivalent resistance R = 120 Ω. What is the rmsvalue Irms of the current flowing through the circuit?

What is the average power Pavg dissipated in the resistor?

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