Question

In an ac circuit, peak value of voltage is 423 volts. Its effective voltage is(a) 400 volts(b) 323 volts(c) 300 volts(d) 340 volts

Answer 1

answer : option (c) 300 volts


explanation :- effective voltage is also known as root mean square value of voltage of alternating current in an AC circuit.

we know, $E_{rms}=\frac{E_{peak}}{\sqrt{2}}$

where $E_{rms}$ denotes the rms voltage and $E_{peak}$ peak voltage in an ac circuit.

here, peak voltage , $E_{peak}$=423 volts

so, effective voltage , $E_{rms}=\frac{423}{\sqrt{2}}$ ≈ 300 volts

hence, effective voltage is 300 volts