The RMS value ofalternating voltage is:
Correct answer: B. 0.7 times the peak value
- A. 0.5 times the peak value
- B. 0.7 times the peak value
- C. 0.7 times the instantaneous value
- D. Equal to maximum voltage
Explanation
The correct option is "0.7 times the peak value." This means that the RMS (Root Mean Square) value of alternating voltage is approximately 0.707 times the peak value. It represents the effective or equivalent value of the voltage that would produce the same amount of heating in a resistor as a DC voltage of the same RMS value.
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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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592 free Alternating Current MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
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