A. 12.0 V
B. 3.5 V
C. 17.0 V
D. 8.5
Correct Answer:
Option A = 12.0 V
Explanation
The r.m.s value of an a.c voltage/current is the value of the d.c. voltage/ current that will dissipate the same amount of energy in a given resistance as the a.c. Thus the r.m.s value of the a.c supply is 12v.
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![A coil of inductance 0.12 H and resistance 4Ω, is connected across a 240V, 50Hz supply. Calculate the current through it. [π = 3.142]](https://erudites.ng/wp-content/plugins/contextual-related-posts/default.png "A coil of inductance 0.12 H and resistance 4Ω, is connected across a 240V, 50Hz supply. Calculate the current through it. [π = 3.142]")