Question

A sine wave with an rms value of $12V$ is riding on a dc level of $18V$. The maximum value of the resulting waveform is

• A. $6V$
  
• B. $30$
  
• C. $35V$
  
• D. $0V$
  

Answer 1

Answer: (C)

$35V$

Rms value of voltage $V_{rms}=12$ volts

Thus peak voltage $V_o=\sqrt{2}{V}_{rms}$

$\therefore$ $V_o=1.414\times 12=17$ volts

Maximum value of resulting waveform $V_{max}=V_o+18$

$⟹$ $V_{max}=17+18=35$ volts