Why we use RMS value instead of peak value?

In everyday use, AC voltages (and currents) are always given as RMS values because this allows a sensible comparison to be made with steady DC voltages (and currents), such as from a battery. For example, a 6V AC supply means 6V RMS with the peak voltage about 8.6V.

Is household voltage RMS or peak?

The 120V is the RMS voltage. And the peak voltage for this is actually 170V. So the peak of this voltage is actually a whole lot bigger than 120V. And if you look at it from peak-to-peak, then the voltage from an AC outlet is actually 340V peak-to-peak.

What is the difference between instantaneous voltage and RMS voltage?

The RMS value is the square root of the mean (average) value of the squared function of the instantaneous values. Since an AC voltage rises and falls with time, it takes more AC voltage to produce a given RMS voltage than it would for DC. For example, it would take 169 volts peak AC to achieve 120 volts RMS (.

What is RMS voltage used for?

The root-mean-square (rms) voltage of a sinusoidal source of electromotive force (Vrms) is used to characterize the source. It is the square root of the time average of the voltage squared. The value of Vrms is V0/ √2, or, equivalently, 0.707V0.

What is the difference between instantaneous current and average current?

Instantaneous current is the amount of charge passing through through a conductor at the moment. Time averaged current is the total amount of charge passing through a conductor in a time interval.

What is difference between RMS and instantaneous?

RMS is 0.707 times the peak value of a sine wave (only). It also happens to be the instantaneous value of a sine wave at 45 degrees. The RMS value (of any waveform) equates to a DC voltage/current that is delivering the same POWER. This is why the RMS value is what we use almost ALL OF THE TIME.