An alternating current is supplied to an electronic component with a warning that the voltage across it should never exceed 12 V.What is the highest rms voltage that can be supplied to this component while staying below the voltage limit in the warning?
A) 6 V
B) 12 V
C) 144 V
D) 6 V

Question

An alternating current is supplied to an electronic component with a warning that the voltage across it should never exceed 12 V.What is the highest rms voltage that can be supplied to this component while staying below the voltage limit in the warning?
A) 6 V 
B) 12 V 
C) 144 V 
D) 6 V

Quizplus · Accepted Answer

The voltage limit given in the warning is the peak voltage, not the RMS voltage. The RMS voltage is equal to the peak voltage divided by the square root of 2. Therefore, the highest RMS voltage that can be supplied to the component without exceeding the voltage limit is 12 V / √2 = 8.49 V. Choice A is the closest answer to this value.

An Alternating Current Is Supplied to an Electronic Component with a Warning