220v电源指示灯用多大电阻，led的灯珠，多种颜色，有红色，绿色，蓝色，都用多大阻值的 LED灯多大的电阻
\u63a5220vled\u6307\u793a\u706f\u7528\u591a\u5927\u7535\u963b\u4e00\u822c\u53d1\u51492113\u4e8c\u6781\u7ba1\u7684\u7535\u6d41\u4e3a5\uff0c30mA\u3002
1\u3001\u8fde\u63a5200\u6b27\u59c6\u7535\u963b\uff0c\u7535\u6d411A\uff0c\u5c0f\u5fc3\u4f60\u7684\u773c\u775b\u6709\u80f6\u6c34\uff0c\u572870\uff0d200\u6b27\u59c6\u9009\u62e9\u7b49\u5f85\u88ab\u70e7LED\uff0c\u5f53\u7136\u4e0d\uff0c\u7528\u4e00\u7cfb\u5217\u666e\u901aLED\u505a\u6307\u793a\u706f43\uff5e47K\uff0c2W\uff5e3W\u7535\u963b\u3002\u7535\u6d41\u4e00\u822c\u4e3a5mA\uff08\u9ad8\u4eaeled\u8fde\u63a5\u7684\u7535\u963b\u4e3a110\uff5e150K\uff0c1\uff0f2w\uff09\uff0c\u7535\u6d41\u4e00\u822c\u4e3a2mA\uff09\uff0c\u706f\u5177\u5e94\u4e0eIN4007\u6216IN4007led\u53cd\u5411\u5e76\u8054\u8fde\u63a5
2\u3001\u5f53\u7136\uff0c\u8fd9\u662f\u6700\u7406\u60f3\u7684\u503c\uff0c\u5305\u62ec\u7535\u7f51\u7684\u6ce2\u52a8\uff0c\u7535\u963b\u6700\u597d\u57281\uff0e5\u4e07\u52301\uff0e6\u4e07\u6b27\u5143\u4e4b\u95f4\uff0c\u800c\u4e00\u7cfb\u5217\u7535\u963b\u4e00\u8d77\u662f\u6700\u597d\u7684\uff0c\u5982\u679c\u628a\u4e00\u4e2a\u7535\u963b\u5206\u6210220V\u538b\uff0c\u6563\u70ed\u5c31\u4e0d\u662f\u5f88\u597d
3\u3001\u4e0d\u540c\u989c\u8272\u7684\u4eae\u5ea6\uff0c\u6839\u636e\u4ed6\u4eec\u7684\u504f\u597d\u53ef\u4ee5\u589e\u52a0\u6216\u51cf\u5c1130k\uff5e50k\uff0c\u4f46\u4e0d\u5f97\u5c11\u4e8e150k\uff0c\u5426\u5219\u5b83\u70e7\u6bc1\u6216\u4f7f\u7528\u65f6\u95f4\u4e0d\u957f\uff0c\u548c\u7535\u6d41\u9650\u5236\u7535\u963b\u529f\u7387\u5e94\u8be5\u8db3\u591f\u5927\uff0c\u4e00\u822c\u4f7f\u75281\uff0f2W\u6216\u591a\u4e2a\u7535\u963b\uff0c\u4e24\u4e2a\u7535\u963b\u4e32\u8054\u66f4\u597d\u3002
\u6269\u5c55\u8d44\u6599\uff1a
\u4e32\u8054\u7535\u963b\u963b\u503c\u8ba1\u7b97\u516c\u5f0f\uff1aR\uff1d\uff3b\uff08Vop\uff0dNVz\uff09ILed\uff3d10
\u5176\u4e2dduVop\u662f\u7535\u6e90\u7535\u538b\uff0cN\u662fLED\u4e2a\u6570\uff0cVz\u662fLed\u5de5\u4f5c\u7535\u538b\u4e00\u822c2\uff5e3V\uff0c\u4e0d\u8981\u8d85\u8fc73V\uff0c\u5426\u5219\u4f1a\u70e7\u574f\uff0cILed\u662fLed\u7684\u5de5\u4f5c\u7535\u6d41\uff0c\u4e00\u822c20mA\uff5e30mA\uff0c\u7531\u4e8eled\u7684\u5185\u963b\u662f\u4e0d\u5b9a\u7684\uff0c\u8fd9\u53ea\u662f\u5927\u6982\u7684\u9650\u6d41\u7535\u963b\u963b\u503c\uff0c\u4e3a\u4fdd\u8bc1\u957f\u671f\u5de5\u4f5c\uff0c\u4e00\u822c\u8fd8\u8981\u7ffb\u4e00\u500d\uff0c\u5927\u6982\u5728220K\u5de6\u53f3\u3002
\u5e02\u7535\u7535\u538b\u4e00\u822c\u5728218V\uff5e230V\u4e4b\u95f4\uff0cled\u7684\u5de5\u4f5c\u7535\u538b\u53ef\u4ee5\u4e0d\u8ba1\u3002\u4e0d\u540c\u7684\u989c\u8272\u4eae\u5ea6\u4e0d\u540c\uff0c\u53ef\u4ee5\u6839\u636e\u81ea\u5df1\u559c\u597d\u589e\u51cf30k\uff5e50k\u3002\u4f46\u7edd\u5bf9\u4e0d\u80fd\u5c0f\u4e8e150k\u3002\u4e0d\u7136\u4e0d\u662f\u70e7\u574f\u5c31\u662f\u7528\u7684\u65f6\u95f4\u4e0d\u957f\u3002\u8fd8\u6709\u5c31\u662f\u9650\u6d41\u7535\u963b\u529f\u7387\u8981\u8db3\u591f\u5927\uff0c\u4e00\u822c\u75281\uff0f2W\u6216\u4ee5\u4e0a\u7684\u7535\u963b\u3002\u3002\u4e24\u4e2a\u7535\u963b\u4e32\u8054\u66f4\u597d\u3002
\u4e00\u30012V\u5de6\u53f3\u70b9\u4eae\u7684LED\u706f(\u5982\u7ea2\u3001\u9ec4\u3001\u6a59\u7b49)\uff1a
12V\uff1a470\u6b27\u8f66\u4e0a12V\uff1a680\u6b27
\u4e8c\uff1a3V\u5de6\u53f3\u70b9\u4eae\u7684LED\u706f(\u5982\u84dd\u3001\u7eff\u3001\u767d\u7b49)\uff1a
12V\uff1a390\u6b27\u8f66\u4e0a12V\uff1a470\u6b27
\u7535\u963b\u7684\u53c2\u6570\u4e00\u822c\u6709\u4e24\u4e2a\uff0c\u963b\u503cR\u548c\u529f\u7387P\u3002
R=\uff08U-Uled\uff09/Iled\uff0cUSB\u7684\u6807\u51c6\u7535\u538b\u662fDC5V\u7684\uff0c\u6240\u4ee5R=\uff085-Uled\uff09/Iled
Uled\uff0c\u706f\u73e0\u7684\u6b63\u5411\u5bfc\u901a\u7535\u538b\u3002Iled\uff0c\u706f\u73e0\u7684\u6b63\u5411\u5bfc\u901a\u7535\u6d41\u3002
\u73b0\u5728LED\u6709\u5f88\u591a\u79cd\u7c7b\uff0c\u989c\u8272\u4e0d\u540c\uff0c\u4e00\u822c\u7535\u6d41\u4e5f\u4e0d\u540c\u3002
\u7535\u963b\u5927\u5c0f\u5f71\u54cd\u7535\u6d41\u5927\u5c0f\uff0c\u8fdb\u800c\u5f71\u54cd\u706f\u73e0\u7684\u4eae\u5ea6\uff0c\u4f46\u53ea\u8981\u4e0d\u8d85\u8fc7\u6b63\u5411\u6700\u5927\u7535\u6d41\uff0c\u90fd\u53ef\u4ee5\u4f7f\u7528\uff0c\u53ea\u662f\u4eae\u5ea6\u6216\u6709\u4e0d\u540c\uff0c\u6240\u4ee5\u9009\u62e9\u8303\u56f4\u6bd4\u8f83\u5927\u3002
\u6269\u5c55\u8d44\u6599\uff1a
LED\u706f\u73e0\u7535\u963b\u7279\u70b9\uff1a
1\u3001\u7535\u538b\uff1aLED\u706f\u73e0\u4f7f\u7528\u4f4e\u538b\u7535\u6e90\uff0c\u4f9b\u7535\u7535\u538b\u57282-4V\u4e4b\u95f4\uff0c\u6839\u636e\u4ea7\u54c1\u4e0d\u540c\u800c\u5f02\uff0c\u6240\u4ee5\u9a71\u52a8\u5b83\u7684\u662f\u4e00\u4e2a\u6bd4\u9ad8\u538b\u7535\u6e90\uff1b\u66f4\u5b89\u5168\u7684\u7535\u6e90\uff0c\u7279\u522b\u9002\u7528\u4e8e\u516c\u5171\u573a\u6240\uff1b
2\u3001\u7535\u6d41\uff1a\u5de5\u4f5c\u7535\u6d41\u57280\u201415mA\uff0c\u4eae\u5ea6\u968f\u7535\u6d41\u7684\u589e\u5927\u800c\u53d8\u4eae
3\u3001\u6548\u80fd\uff1a\u6d88\u8017\u80fd\u91cf\u8f83\u540c\u5149\u6548\u7684\u767d\u70bd\u706f\u51cf\u5c1180%\u3002
4\u3001\u9002\u7528\u6027\uff1a\u5f88\u5c0f\uff0c\u6bcf\u4e2a\u5355\u5143LED\u5c0f\u7247\u662f3-5mm\u7684\u6b63\u65b9\u5f62\uff0c\u6240\u4ee5\u53ef\u4ee5\u5236\u5907\u6210\u5404\u79cd\u5f62\u72b6\u7684\u5668\u4ef6\uff0c\u5e76\u4e14\u9002\u5408\u4e8e\u6613\u53d8\u7684\u73af\u5883\u3002
6\u3001\u54cd\u5e94\u65f6\u95f4\uff1a\u5176\u767d\u70bd\u706f\u7684\u54cd\u5e94\u65f6\u95f4\u4e3a\u6beb\u79d2\u7ea7\uff0cLED\u706f\u7684\u54cd\u5e94\u65f6\u95f4\u4e3a\u7eb3\u79d2\u7ea7\u3002
7\u3001\u5bf9\u73af\u5883\u6c61\u67d3\uff1a\u65e0\u6709\u5bb3\u91d1\u5c5e\u6c5e\u3002
8\u3001\u989c\u8272\uff1a\u6539\u53d8\u7535\u6d41\u53ef\u4ee5\u53d8\u8272\uff0c\u53d1\u5149\u4e8c\u6781\u7ba1\u65b9\u4fbf\u5730\u901a\u8fc7\u5316\u5b66\u4fee\u9970\u65b9\u6cd5\uff0c\u8c03\u6574\u6750\u6599\u7684\u80fd\u5e26\u7ed3\u6784\u548c\u5e26\u9699\uff0c\u5b9e\u73b0\u7ea2\u9ec4\u7eff\u5170\u6a59\u591a\u8272\u53d1\u5149\u3002\u5982\u5c0f\u7535\u6d41\u65f6\u4e3a\u7ea2\u8272\u7684LED\uff0c\u968f\u7740\u7535\u6d41\u7684\u589e\u52a0\uff0c\u53ef\u4ee5\u4f9d\u6b21\u53d8\u4e3a\u6a59\u8272\uff0c\u9ec4\u8272\uff0c\u6700\u540e\u4e3a\u7eff\u8272\u3002
现在大多数的发光二极管的最大电流都在30mA以内，作为指示用的灯珠的电流有几个毫安就可以了。所以这个灯珠接在220V的电路中，最重要的是对灯珠的限流，把流向灯珠的电流限制在30mA以内，灯珠就是安全的。现在我们把流向灯珠的电流限制在10mA以内，根据电阻等于电压除以电流的公式，其电阻应为：220÷0.01＝22000（Ω）＝22K。所以，用22K的电阻即可。
120k
你用100K的试试
100K吧，太大了灯会不怎么亮，太小容易烧。
绛旓細鐜板湪鐨勬寚绀虹伅澶у鏄疞ED鍙戝厜浜屾瀬绠′簡锛屾寚绀虹伅鏈変竴鐐圭數娴侊紝灏辫兘浜紝鎵浠ョ數闃200K宸﹀彸灏辫锛岀害1姣畨鐨勭數娴佺殑浜害涔熻冻澶熶綔涓烘寚绀虹伅浜哰(220-3)梅200K鈮1姣畨銆傚鏋滄槸姘栫伅锛岀數闃500K~5M惟鍧囧彲锛岀數闃昏秺澶э紝鐢垫祦瓒婂皬锛屽鍛借秺闀裤傚浜嶭ED鎸囩ず鐏紝LED鐨勭殑鐢靛帇闄嶅彧鏈2~3V, 220V鐨勭數鍘嬪嚑涔庡叏钀藉湪鐢甸樆涓婏紝濡傛灉鏄...
绛旓細鎵浠ワ紝220v鐢垫寚绀虹伅鐨勭數闃绘槸 48400 惟銆
绛旓細1銆佹帴200娆х數闃銆傜數娴1A锛屼笉鑳70鈥200娆у閫夋嫨銆傜敤鏉ュ仛鎸囩ず鐏殑鏅氬彂鍏夛紝浜屾瀬绠′覆鎺43~47K锛2W~3W鐨勭數闃汇傜數娴佷竴鑸5mA(楂樹寒鐨勫彂鍏変簩鏋佺鎺ョ殑鐢甸樆澶х偣110~150K锛1/2W銆傜數娴佷竴鑸2mA)锛岀伅瑕佸弽鍚戝苟鑱斾竴涓彂鍏変簩鏋佺IN4007鎴朓N4007銆2銆佸綋鐒惰繖鏄悊鎯冲硷紝绠椾笂鐢电綉娉㈠姩锛屼覆鐨勭數闃绘渶濂藉湪15鑷16鍗冩涔嬮棿锛...
绛旓細浠220V锛屾櫘閫氱孩鑹茬殑LED涓轰緥锛屽帇闄嶅彇2V锛岀數娴佸彇2mA锛闄愭祦鐢甸樆涓120K惟銆傜敱浜嶭ED浠呴渶寰急鐢垫祦鍗冲彲鐐逛寒锛屽嚭浜庡畨鍏ㄥ拰淇濋殰闀挎椂闂存甯镐娇鐢ㄨ冭檻锛屽彲浠ュ彇鍊150K惟 - 500K惟锛屽姛鐜1/4W浠ヤ笂鐨勬爣鍑嗙數闃汇
绛旓細1. 鎸囩ず鐏氬父浣跨敤LED鍙戝厜浜屾瀬绠★紝杩欑鐏叿鍙渶寰堝皬鐨勭數娴佸氨鑳藉彂鍏夈傚洜姝わ紝鍚堥傜殑鐢甸樆鍊煎ぇ绾﹀湪200K娆у宸﹀彸锛岃繖鏍峰彲浠ヤ繚璇佸ぇ绾1姣畨鐨勭數娴侀氳繃锛岃冻浠ヤ娇鎸囩ず鐏寒璧枫傝绠楁柟寮忓涓嬶細[(220V - 3V) 梅 200K娆у] 鈮 1姣畨銆2. 瀵逛簬姘栫伅杩欑被鎸囩ず鐏紝鐢甸樆鍊煎彲浠ュ湪500K娆у鍒5M娆у涔嬮棿閫夋嫨銆傜數闃昏秺澶э紝閫氳繃...
绛旓細100K惟~200K惟涔嬮棿銆傜數闃讳竴鑸湪100K惟~200K惟涔嬮棿銆傚湪鐢垫簮鏄220V浜ゆ祦鐢垫椂锛屼覆鑱旂殑鐢甸樆瑕佸ぇ浜100K惟锛屼竴鑸湪100K惟~200K惟涔嬮棿銆傞樆鍊煎お灏忚姹鐢甸樆鍣鍔熺巼澶э紝杩樺鏄撶儳鍧廘ED銆傜敤楂樹寒搴ED锛岄樆鍊艰繕鍙互澶с
绛旓細100鍗冩鑷200鍗冩涔嬮棿銆傚湪鐢垫簮鏄220浼浜ゆ祦鐢垫椂锛屼覆鑱旂殑鐢甸樆瑕佸ぇ浜100鍗冩锛岄樆鍊煎お灏忚姹鐢甸樆鍣鍔熺巼澶э紝杩樺鏄撶儳鍧廘ED銆
绛旓細220v鐢垫簮鎸囩ず鐏數闃涓嶆槸鏃犵┓澶с傚洜涓哄湪鐢垫簮鏄220V浜ゆ祦鐢垫椂锛屼覆鑱旂殑鐢甸樆瑕佸ぇ浜100K惟锛屽湪100K惟~200K惟涔嬮棿锛屽苟涓嶆槸鏃犵┓澶э紝杩欐槸鏈夋爣鍑嗗叕寮忕殑銆
绛旓細1銆佷娇鐢ㄥ競鐢 220V 鐨勬寚绀虹伅鏈変笁绉嶏細鐧界偨灏忕伅娉°丩ED 鎸囩ず鐏彔銆佸拰姘栨皵鏀剧數鐏场銆2銆佺櫧鐐藉皬鐏场锛氾紙220V - 灏忕伅娉＄數鍘嬶級梅 灏忕伅娉″伐浣滅數娴 = 闄嶅帇鐢甸樆銆3銆丩ED 灏忕伅鐝犻渶瑕佺洿娴佷綆鍘鐢碉紝璁＄畻鏂规硶涓庡皬鐧界偨鐏场鐩稿悓锛屼絾瑕佷覆鑱斾簩鏋佺銆4銆侀噰鐢ㄦ皷姘旀斁鐢靛皬鐏场锛屼緷闈犵數鍘嬬偣鐕冪殑锛屽彲浠 200K 鈥 500K 鐢甸樆鍗冲彲...
绛旓細P = 0.02^2 * 11000 = 0.44W銆傚洜姝わ紝鎴戜滑鍙互閫夋嫨涓涓瀹氬姛鐜囧ぇ浜0.44W鐨11kΩ鐢甸樆銆傝娉ㄦ剰锛屼互涓婅绠椾粎渚涘弬鑰冦傚湪瀹為檯搴旂敤涓紝杩橀渶瑕佽冭檻鍏朵粬鍥犵礌锛屽鐢垫簮鐨勭ǔ瀹氭с丩ED鐨勫疄闄呮ц兘绛夈傚彟澶栵紝LED鐩存帴杩炴帴鍒220V鐢垫簮鏄嵄闄╃殑锛屽簲璇ヤ娇鐢ㄩ傚綋鐨勭數婧愯浆鎹㈢數璺垨鑰匧ED椹卞姩鍣ㄦ潵纭繚瀹夊叏銆
