What is the approximate peak voltage for an ordinary household A.C. circuit?

The approximate peak voltage for an ordinary household alternating current (A.C.) circuit, which typically operates at 120 volts root mean square (RMS), is about 170 volts. This is calculated using the formula for converting RMS voltage to peak voltage, which is RMS voltage multiplied by the square root of 2 (approximately 1.414). Therefore, in a household A.C. circuit that runs at 120 volts, the peak voltage is around 120 volts x 1.414, equating to roughly 170 volts.

While the choice selected indicates 150 volts, it's important to note that this value is not accurate based on the standard calculations. The peak voltage for typical household circuits can vary slightly depending on specific local regulations and standards, but it won't reach as high as 200 or 250 volts for standard outlets. Consequently, understanding the relationship between RMS values and peak values is crucial for ensuring safety and proper functioning of electrical devices in a household A.C. setting.