[wellylug] RMS?

[Jamie Baddeley]

> On 6/9/05, E.Chalaron wrote:
> > Who [snip]  is RMS ?


When using a meter to measure the same AC voltage a different value is
obtained. This is because, as we said, meters measure RMS values.

A Root Mean Square (RMS) voltage gives the same heating effect as a DC
voltage of the same value. 
See figures 2 and 3. Both thermometers show the same temperature when
the resistors are heated by the current passing through them.

figure 1.
:-)

figure 2:
:-(

RMS values can be converted to peak to peak values and vice-versa.

RMS values times 1.414 equals the Peak value. 
Peak to Peak is twice this. 
7.07 volts RMS times 1.414 and then doubled is 20 volts, the Peak to
Peak value.

Peak values times 0.707 gives the RMS value. 
Don't forget that Peak is half the Peak to Peak. 
20 volts Peak to Peak is 10 volts Peak.  10 volts Peak times 0.707
equals 7.07 volts RMS.

The Mains supply voltage in the UK is 230 volts RMS. 

>> So we know who RMS is.. Who the hell is Volts?