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  https://wodewangzhishime.blogspot.com/2024/02/blog-post.html . Ref:  https://wodewangzhishime.blogspot.com/2024/02/blog-post.html . . . Me: Have a look .  https://wodewangzhishime.blogspot.com/2021/10/httpswodewangzhishime_90.html . . Hawaii fire which claim 130 people's lives. John:OK. Me: In reality, is there any serial circuit? John: Look at the above picture. Point A and B are parallel cirucit. I guess, point C is serial cirucit. John: You're wrong. Point C is a parallel circuit too.

  https://wodewangzhishime.blogspot.com/2023/12/blog-post_14.html   . Ref:  https://wodewangzhishime.blogspot.com/2023/12/blog-post_14.html . . . Me: There're 4 pictures above. . We mention the 1st picture. There is a full wave rectifier. . .When the smoothing capacitor discharge, the gap between the Up and Down cycle is filled. . Consequently, the wave-form of the direct current become smooth. . John: OK. . Me: Now, we look at the 2nd picture. . Case 1. high frequency  <--- The curve is very smooth. . The discharge of the smoothing capacitor can easily fill the gap. . Case 2. middle frequency <--- The curve isn't smooth. . The discharge of the smoothing capacitor can hardly fill the gap. . Case 3. low frequency <--- The curve can't continue. . . The direct current is broken. . The discharge of the smoothing capacitor can't fill the gap. . John: Now, we look at the 2nd picture. . . 1) In direct current, if the frequency is high, the discharge of the smoothing