When the r.m.s value of a source of electricity supply is given as 240v, it means that the peak value of the supply is
240v
340v
480v
57600v
Correct answer is B
The relationship between the peak value and r.m.s value of electricity supply is given as
V\(_{r.m.s}\) = \(\frac{V_o}{\sqrt{2}}\)
where Vo = peak voltage
∴ Vo = V\(_{r.m.s}\) × √2
= 240 × √2
= 339.5v
= 340v