R
RR
- Jan 1, 1970
- 0
Hi,
As I understand it, RMS is calculated on the area under the sine or cosine
wave for the AC supply and the peak voltage.
It happens to work out at 0.707 of peak, as I understand, for mains supply.
The frequency (50Hz or 60Hz, 100Hz, or 1Hz) makes no difference to this if
the peak is unchanging. Is that correct?
I've attempted to follow the calculations here:
http://www.alpharubicon.com/altenergy/understandingAC.htm
and the frequency seems to always reduce to a factor of 0.5.
So, why does an appliance designed for 240volts 50Hz care whether you supply
240volts 60Hz or 240volts 100Hz, for that matter?
Or does merely depend on the type of appliance? I can see how a motor that
relies on the frequency would care, but some appliances should not care
less.
What have I missed?
tia,
RR
As I understand it, RMS is calculated on the area under the sine or cosine
wave for the AC supply and the peak voltage.
It happens to work out at 0.707 of peak, as I understand, for mains supply.
The frequency (50Hz or 60Hz, 100Hz, or 1Hz) makes no difference to this if
the peak is unchanging. Is that correct?
I've attempted to follow the calculations here:
http://www.alpharubicon.com/altenergy/understandingAC.htm
and the frequency seems to always reduce to a factor of 0.5.
So, why does an appliance designed for 240volts 50Hz care whether you supply
240volts 60Hz or 240volts 100Hz, for that matter?
Or does merely depend on the type of appliance? I can see how a motor that
relies on the frequency would care, but some appliances should not care
less.
What have I missed?
tia,
RR