After this lesson, you should be able to:

- Explain the advantages of alternating current
- Write expressions for current and voltage in an AC circuit
- Define the rms values for current and voltage and explain their usage
- Know that the average power is given by
*P*_{av}= I_{rms}V_{rms}= ½ I_{max}V_{max} - Draw graphs of voltage versus time and current versus time for an AC circuit
- Solve problems using the concepts
*P*and_{av,}I_{rms}*V*_{rms}

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15 lessons in Physics