The r.m.s value of a supply voltage is quoted at 200v. What is the approximate peak value of the voltage?

The approximate peak value of the voltage is "283 volts". The r.m.s (root mean square) value of a supply voltage is a measure of the effective value of the voltage, which is equivalent to the heating effect of the voltage on a resistive load. The peak value of a sinusoidal voltage waveform is equal to the r.m.s value multiplied by the square root of 2 (√2). So, for a 200v r.m.s voltage, the peak value can be calculated as follows: Peak value = 200v × √2 = 200v × 1.414 = 283 volts This means that the maximum value of the voltage waveform is approximately 283 volts. It's important to note that this is just an approximation, and the actual peak value may vary depending on the shape of the voltage waveform.