5. 桥式整流电路
原理：演示四只二极管组成的电桥如何将交流电的正负半周都转换为正向直流。 
<!DOCTYPE html>
<html lang=\”zh-CN\”>
<head>
<meta charset=\”UTF-8\”>
<title>桥式整流</title>
<style>
body {
background: #222; color: #eee; font-family: sans-serif; display: flex; flex-direction: column; align-items: center; padding: 20px; }
.bridge {
position: relative; width: 200px; height: 200px; margin: 20px; }
.d {
position: absolute; width: 30px; height: 30px; border: 2px solid #666; display: flex; align-items: center; justify-content: center; font-size: 10px; background: #333; }
.d-top {
top: 0; left: 50%; transform: translateX(-50%); } /* D1 */
.d-bottom {
bottom: 0; left: 50%; transform: translateX(-50%
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