I found this A/C compressor AC capacitor. Its rated for 450VAC 40uF. It says its filled with vegetable oil as the label says. I had a 120V to 220/440V industrial transformer. So I plugged it into my 120V 300W UPS and charged the capacitor with 420VAC from the transformer and measured it with my multimeter on AC voltage and it showed 400+ VAC. Doesn't capacitors store + & - charge on either plates? How can it store AC current which has alternating polarities?
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