In alternating current circuits,the a.c. mete | vedclass

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(A) In alternating current $(a.c.)$ circuits,the current and voltage vary sinusoidally with time. Since the average value of an alternating current ov

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$r.m.s.$ value

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(A) In alternating current $(a.c.)$ circuits,the current and voltage vary sinusoidally with time. Since the average value of an alternating current over a complete cycle is zero,standard $a.c.$ meters (like ammeters and voltmeters) are designed to measure the root mean square $(r.m.s.)$ value. The $r.m.s.$ value represents the effective value of the alternating current,which is equivalent to the direct current $(d.c.)$ that would produce the same amount of heat in a resistor. Therefore,the correct option is $A$.

In alternating current circuits,the $a.c.$ meters measure

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