Short is always easy to check by measuring resistance.
(just don't use insulation resistance meter)
But instead of "Let me try to carry that. I can do this... I can do this... Nope, that's too much weight to carry the needed distance", shorted capacitor would likely cause sharp instant cut off.
And in power circuitry high current would likely cause signs to capacitor, because before complete short there would be likely increase of current and heating.
In ideal capacitor its impedance (total AC resistance) would depend only on (capacitive) reactance dependant on capacitance and frequency and would drop with frequency.
Instead in non-theoretical capacitor ESR literally limits how low impedance can go making it plateau.
(until some inherent inductance in real world capacitor starts increasing impedance)
Also ESR corresponds linearly to actual power loss into heat in capacitor.
Hence high ESR capacitor not only filters ripple less effectively, but also heats up more easily shortening its life span.
(reactance doesn't consume power)
en.wikipedia.org
(just don't use insulation resistance meter)
But instead of "Let me try to carry that. I can do this... I can do this... Nope, that's too much weight to carry the needed distance", shorted capacitor would likely cause sharp instant cut off.
And in power circuitry high current would likely cause signs to capacitor, because before complete short there would be likely increase of current and heating.
Resistance works just as well at AC as DC, which is the problem.
In ideal capacitor its impedance (total AC resistance) would depend only on (capacitive) reactance dependant on capacitance and frequency and would drop with frequency.
Instead in non-theoretical capacitor ESR literally limits how low impedance can go making it plateau.
(until some inherent inductance in real world capacitor starts increasing impedance)
Also ESR corresponds linearly to actual power loss into heat in capacitor.
Hence high ESR capacitor not only filters ripple less effectively, but also heats up more easily shortening its life span.
(reactance doesn't consume power)
