a capacitor is frequently placed across a 110V line to reduce the noise in radios?
February 9, 2010 - 11:44 am
a capacitor is frequently placed across a 110V line to reduce the noise in radios.what is the smallest voltage such a capacitor should have?
110 VAC is the rms voltage that is an effective equivalent to 110VDC.
The 110 VAC voltage actually gets to a higher peak voltage of
1.414 x 110 = 155.54 volts peak
These higher peak voltages although brief in duration can damage a capacitors dielectric insulation if the peak voltage exceeds the working voltage of the cap
You could also add a safety factor of at least 10%(or more) so a cap rated no less than 175 would be required. Higher voltage rated caps (200v for example) would work and provide an added measure of safety
February 9th, 2010 at 5:13 pm
110V. That’s the operating voltage, right? The capacitor should have a rating equal to the operating voltage.
Is that what you were asking?
References :
February 9th, 2010 at 5:50 pm
110 VAC is the rms voltage that is an effective equivalent to 110VDC.
The 110 VAC voltage actually gets to a higher peak voltage of
1.414 x 110 = 155.54 volts peak
These higher peak voltages although brief in duration can damage a capacitors dielectric insulation if the peak voltage exceeds the working voltage of the cap
You could also add a safety factor of at least 10%(or more) so a cap rated no less than 175 would be required. Higher voltage rated caps (200v for example) would work and provide an added measure of safety
References :
http://www.bcae1.com/voltages.htm