Calculate the peak voltage of a mains supply of r.ms. value 220V.
A
121 V
B
156 V
C
225 V
D
240 V
E
311 V
Verified Correct Answer: E.
Physical Principles & Numerical Solution
To calculate the peak voltage (\(V_p\)) from the root mean square (RMS) voltage (\(V_{rms}\)), we use the formula:
\(V_p = V_{rms} \times \sqrt{2}\)
Given:
\(V_{rms} = 220 \, \text{V}\)
Calculate the Peak Voltage
\(V_p = 220 \, \text{V} \times \sqrt{2} \approx 220 \, \text{V} \times 1.4142 \approx 311.1 \, \text{V}\)
The peak voltage is approximately:
311 V
Source: Myschool Past Questions Archive (Record #42771)