Final answer:
The rms voltage can be calculated from the peak voltage of an AC supply by dividing the peak voltage by the square root of 2. For a supply with a peak voltage of 300 V, the rms voltage is approximately 212 V.
Step-by-step explanation:
The subject of this question is Physics, as it involves understanding the relationship between peak voltage and root mean square (rms) voltage in an alternating current (AC) circuit. This type of question is commonly encountered by high school students, particularly those taking courses related to electricity and circuits.
To find the rms voltage from the peak voltage of an AC supply, you use the formula where Vrms is equal to the peak voltage Vo divided by the square root of 2. This relationship expresses how the rms voltage represents the effective voltage of an AC supply, which is less than the peak voltage due to the alternating nature of the current. Applying this formula, Vrms = Vo / √2, to the peak voltage of 300 V would result in an rms voltage of 300 V / 1.414, which is approximately 212 V.
As a reference, heavy industrial equipment that uses AC power with a peak voltage of 679 V would have an rms voltage calculated by the same method, giving 679 V / √2 or approximately 480 V.