The RMS value of an AC current is:
Correct answer: C. That steady current that produces the same rate of heating in a resistor as the actual current
- A. Its peak value
- B. Its average value
- C. That steady current that produces the same rate of heating in a resistor as the actual current
- D. That steady current that charges a battery at the same rate as the actual current
Explanation
The RMS (Root Mean Square) value of an AC current is a way to represent its effective or equivalent DC value. It is defined as the steady current that would produce the same rate of heating in a resistor as the actual AC current.Explanations for Wrong Choices:- (a) Its peak value: Incorrect. The RMS value is not equal to the peak value of the AC current.- (b) Its average value: Incorrect. The RMS value is not equal to the average value of the AC current.- (d) That steady current that charges a battery at the same rate as the actual current: Incorrect. The RMS value is related to heating in a resistor, not charging a battery.So, the correct answer is (c) That steady current produces the same rate of heating in a resistor as the actual current.
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Electromagnetic waves consist of mutually perpendicular, oscillating electric and magnetic fields that also remain perpendicular to the direction of propagation. They travel through vacuum at the speed of light and include radio waves, microwaves, infrared, visible, ultraviolet, X-rays and gamma rays. Unlike mechanical waves, they do not require a material medium.
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