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?

A. 240v
B. 340v
C. 480v
D. 57600v

Correct Answer:

Option B – 340v

Explanation

The relationship between the peak value and r.m.s value of electricity supply is given as

Vr.m.s = Vo/√2

where Vo = peak voltage

∴ Vo = Vr.m.s × √2

= 240 × √2

= 339.5v

= 340v