The alternating voltage or current is actually measured by:
Correct answer: A. Its RMS value
- A. Its RMS value
- B. Square root of its mean square value
- C. Peak value
- D. Instantaneous value
Explanation
The correct option is "its RMS value." The RMS (Root Mean Square) value represents the effective or equivalent value of the alternating voltage or current. It is calculated as the square root of the mean of the squares of all the instantaneous values over one complete cycle. This value accurately reflects the magnitude of the voltage or current.
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About Alternating Current
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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