Battery–capacitor_flash
Battery–capacitor flash
Type of photographic flash system
A battery–capacitor flash (BC flash) is a flash photography system used with flashbulbs. Instead of relying directly on the current pulse ability of a photoflash battery to directly fire a flashbulb, a battery is used to charge a capacitor that is then discharged through the flashbulb. BC flash units use 5.6 V, 15 V, or 22½ V batteries.