The r.m.s value of alternating current is equal to its maximum value at angle of:
Correct answer: B. 45o
- A. 60o
- B. 45o
- C. 30o
- D. 90o
Explanation
This is the correct answer. In an alternating current waveform, the r.m.s value is equal to the maximum value of the current when the phase angle is 45°. This is a fundamental relationship in A.C circuit analysis. The r.m.s value represents the effective value of the current or voltage in an A.C circuit. Irms=0.707I0 Irms=J0sin45o
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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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