Q1:

What is the dc voltage of the waveform in the given circuit?

ANS:C - 6 V

The term RMS stands for root mean square. Most AC voltmeters display RMS voltage. The
120 V at your wall outlet is an RMS value. The RMS value, also referred to as the effective
value, of a sinusoidal voltage is actually a measure of the heating effect of the sine wave.

For example, when a resistor is connected across an AC (sinusoidal) voltage source, a certain amount of heat is generated by the power in the resistor. The value of the DC voltage can be adjusted so that the resistor gives off the same amount of heat as it does when connected to the AC source.

The RMS value of a sinusoidal voltage is equal to the DC voltage that produces the
same amount of heat in a resistance as does the sinusoidal voltage.