After bridge rectification, the commercial power is filtered again, reaching 3 1 1v, and then connected with an AC light bulb. Why does the voltage drop a lot?

Because the commercial power is alternating current, the peak voltage of 220V alternating current is about 3 1 1. Because there is no load, the capacitor energy storage will reach the highest voltage. Due to the short peak time, the voltage will drop after loading. Commercial power is defined as 220V because its working capacity is equivalent to the output power of DC 220V voltage under the same load and time.

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