What is the average value of a sinusoidal voltage that has a peak value of 15 volts?
Correct answer: A. 0 V
- A. 0 V
- B. 9.56 V
- C. 10.6 V
- D. 19.1 V
Explanation
The average value of any complete sinusoidal waveform (like AC voltage or current) over one full cycle is zero. The positive half of the wave has an area that is exactly cancelled by the equal and opposite area of the negative half.
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Alternating current varies periodically, so phase relationships become essential when current passes through a resistor, capacitor or inductor. The chapter distinguishes resistance from capacitive and inductive reactance, explains phase lead and lag, and connects changing electric and magnetic fields with the production and properties of electromagnetic waves.
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