这个怎么算的，电学 初三物理电学计算公式有哪些
\u5982\u4f55\u89e3\u7b54\u4e2d\u8003\u7535\u5b66\u8ba1\u7b97\u9898\u7b2c\u4e00\u6b65\uff1a\u5f04\u6e05\u56db\u4e2a\u95ee\u9898
1\u3001\u5f04\u6e05\u7528\u7535\u5668\u4e4b\u95f4\u7684\u8fde\u63a5\u65b9\u5f0f\uff08\u4e32\u8054\u3001\u5e76\u8054\uff09
2\u3001\u5f04\u6e05\u5404\u7535\u8868\uff08A\u8868\u3001V\u8868\uff09\u7684\u6d4b\u91cf\u5bf9\u8c61
3\u3001\u5f04\u6e05\u6ed1\u52a8\u53d8\u963b\u5668\u63a5\u5165\u7535\u8def\u7684\u90e8\u5206
4\u3001\u5f04\u6e05\u9898\u4e2d\u7684\u5df2\u77e5\u6761\u4ef6\u548c\u63d0\u4f9b\u7684\u7269\u7406\u8fc7\u7a0b\uff08\u6ed1\u7247\u79fb\u52a8\u3001\u5f00\u5173\u901a\u65ad\uff09
\u7b2c\u4e8c\u6b65\uff1a\u753b\u51fa\u7b49\u6548\u7535\u8def
1\u3001\u6839\u636e\u63d0\u4f9b\u7684\u7269\u7406\u8fc7\u7a0b\uff0c\u5206\u522b\u753b\u51fa\u5bf9\u5e94\u7684\u7535\u8def\u56fe
\u7b2c1\u6b65\uff1a\u5c06\u56e0\u4e3a\u65ad\u8def\u3001\u77ed\u8def\u800c\u4e0d\u5de5\u4f5c\u7684\u7528\u7535\u5668\u5220\u6389\uff0c\u53ea\u4fdd\u7559\u6709\u7535\u6d41\u901a\u8fc7\u7684\u7528\u7535\u5668\u6216\u7535\u8868
\u7b2c2\u6b65\uff1a\u5982\u7535\u8def\u4e2d\u7684\u7535\u8868\u5f71\u54cd\u5230\u7535\u8def\u8fde\u63a5\u7684\u5224\u65ad\uff0c\u5219\u628aV\u8868\u53bb\u6389\uff0cA\u8868\u753b\u6210\u5bfc\u7ebf\uff0c\u518d\u505a\u5224\u65ad
\u7b2c3\u6b65\uff1a\u660e\u786e\u7528\u7535\u5668\u8fde\u63a5\u65b9\u5f0f\u540e\uff0c\u628a\u7535\u8868\u8fd8\u539f\u5230\u539f\u4f4d\u7f6e\uff0c\u660e\u786e\u5176\u6d4b\u91cf\u5bf9\u8c61
\u7ed3\u679c\uff1a\u7b80\u5316\u7535\u8def\u540e\uff0c\u8981\u4e48\u53ea\u6709\u4e00\u4e2a\u7528\u7535\u5668\uff0c\u8981\u4e48\u662f\u51e0\u4e2a\u7528\u7535\u5668\u7684\u4e32\u8054\u6216\u5e76\u8054
2\u3001\u5728\u56fe\u4e2d\u6807\u51fa\u5df2\u77e5\u91cf\u7684\u7b26\u53f7\u3001\u6570\u636e\u548c\u672a\u77e5\u91cf\u7684\u7b26\u53f7
\u7b2c\u4e09\u6b65\uff1a\u8fdb\u884c\u7535\u8def\u5206\u6790
1\u3001\u6839\u636e\u7535\u8def\u8fde\u63a5\u65b9\u5f0f\u7279\u70b9\uff0c\u5bfb\u627e\u5df2\u77e5\u91cf\u4e0e\u672a\u77e5\u91cf\u7684\u5173\u7cfb
1\uff09\u4e32\u8054\u7535\u8def\u4e2d\u7535\u6d41\u5904\u5904\u76f8\u7b49\u3002
2\uff09\u5e76\u8054\u7535\u8def\u4e2d\uff0c\u5404\u652f\u8def\u4e24\u7aef\u7684\u7535\u538b\u76f8\u7b49\uff0c\u7535\u8def\u4e2d\u7684\u7535\u6e90\u7535\u538b\u4fdd\u6301\u4e0d\u53d8\u3002
3\uff09\u5bb6\u5ead\u7535\u8def\u4e2d\uff0c\u9690\u542b\u6709\uff1a\u7535\u538b\u6052\u4e3a220V\uff0c\u7167\u660e\u7535\u8def\u4e2d\u7684\u7528\u7535\u5668\u7684\u989d\u5b9a\u7535\u538b\u4e3a220V
4\uff09\u5b9a\u503c\u7535\u963b\u5728\u7535\u8def\u4e2d\u7684\u7535\u963b\u4e0d\u53d8\uff0c\u901a\u8fc7\u5b83\u7684\u7535\u6d41\u6216\u52a0\u5728\u4e24\u7aef\u7684\u7535\u538b\u5374\u4f1a\u53d1\u751f\u6539\u53d8
\uff081\uff09\u5728\u4e32\u8054\u7535\u8def\u4e2d\uff0c\u901a\u8fc7\u7684\u7535\u6d41\u968f\u603b\u7535\u963b\u7684\u589e\u5927\u800c\u51cf\u5c0f\uff0c\u52a0\u5728\u4e24\u7aef\u7684\u7535\u538b\u4e5f\u51cf\u5c0f \uff082\uff09\u5728\u5e76\u8054\u7535\u8def\u4e2d\uff0c\u52a0\u5728\u4e24\u7aef\u7684\u7535\u538b\u548c\u901a\u8fc7\u7684\u7535\u6d41\u90fd\u4e0d\u53d8
2\u3001\u627e\u51fa\u7535\u8def\u4e2d\u7684\u4e0d\u53d8\u7684\u91cf\uff08\u7535\u538b\u6052\u5b9a\u3001\u5b9a\u503c\u7535\u963b\u7b49\uff09\u4e0e\u53d8\u5316\u7684\u91cf\u7684\u5173\u7cfb
\u7b2c\u56db\u6b65\uff1a\u5e94\u7528\u516c\u5f0f\u6c42\u89e3
1\u3001\u6839\u636e\u7535\u8def\u7279\u70b9\uff0c\u5148\u6c42\u51fa\u9690\u542b\u91cf
2\u3001\u6839\u636e\u9898\u76ee\u6240\u6c42\u7269\u7406\u91cf\uff0c\u5217\u51fa\u8ba1\u7b97\u516c\u5f0f\uff0c\u4ee3\u5165\u6570\u636e\u6c42\u89e3
http://wenku.baidu.com/link?url=B5VGSh-kqmeCKfZ6ATkfp1_8C7h3AdhC3pec_jwILqZsiSFKN5XCTuWi-TgaGYXV0x76_Tg72Ypwa5-idwSxfVl5hDj__4hNdpX-hxAQLKC
\u5e0c\u671b\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9
5td(sin(4π)t)/dt=5tx4πd(sin(4π)t)/d(4π)t=5tx4πcos4πt=20πtcos4πt
绛旓細I=U/R锛堟濮嗗畾寰:瀵间綋涓殑鐢垫祦璺熷浣撲袱绔數鍘嬫垚姝ｆ瘮锛岃窡瀵间綋鐨勭數闃绘垚鍙嶆瘮锛塈=I1=I2=鈥=In (涓茶仈鐢佃矾涓數娴佺殑鐗圭偣锛氱數娴佸澶勭浉绛)U=U1+U2+鈥+Un (涓茶仈鐢佃矾涓數鍘嬬殑鐗圭偣锛氫覆鑱旂數璺腑锛屾荤數鍘嬬瓑浜庡悇閮ㄥ垎鐢佃矾涓ょ鐢靛帇涔嬪拰)4锛 I=I1+I2+鈥+In (骞惰仈鐢佃矾涓數娴佺殑鐗圭偣锛氬共璺笂鐨勭數娴佺瓑浜庡悇鏀矾...
绛旓細1銆佹濮嗗畾寰嬫槸鐢靛鍩烘湰鍏紡涔嬩竴锛屽叕寮忎负I=U/R锛屽叾涓璉涓虹數娴侊紝鍗曚綅涓哄畨鍩癸紙A锛夛紱U涓虹數鍘嬶紝鍗曚綅涓轰紡鐗癸紙V锛夛紱R涓虹數闃伙紝鍗曚綅涓烘濮嗭紙惟锛夈傛濮嗗畾寰嬭繕鍙互鎺ㄥ鍑哄叾浠栫殑鍏紡锛屼緥濡傦細U=IR锛孯=U/I绛夈2銆佺數鍔熺殑璁＄畻鍏紡涓篧=UIt锛屽叾涓璚涓虹數鍔燂紝鍗曚綅涓虹劍鑰筹紙J锛夛紱U涓虹數鍘嬶紝鍗曚綅涓轰紡鐗癸紙V锛夛紱I涓虹數...
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绛旓細鐢垫祦鐨璁＄畻鏄鐢靛涓潪甯搁噸瑕佺殑涓閮ㄥ垎锛岀數娴佺殑璁＄畻鍏紡鏄細I=Q/t锛屽叾鐩稿叧鍐呭濡備笅锛1銆両鏄數娴侊紝Q鏄數鑽烽噺锛宼鏄椂闂淬杩欎釜鍏紡鍛婅瘔鎴戜滑锛岀數娴佸ぇ灏忎笌鍗曚綅鏃堕棿鍐呴氳繃瀵间綋妯埅闈㈢殑鐢佃嵎閲忔垚姝ｆ瘮銆備篃灏辨槸璇达紝鐢垫祦鐨勫ぇ灏忓彇鍐充簬鍗曚綅鏃堕棿鍐呮湁澶氬皯鐢佃嵎閫氳繃瀵间綋銆2銆佸湪璁＄畻鐢垫祦鏃讹紝鎴戜滑杩橀渶瑕佽冭檻鐢靛帇鍜岀數闃汇傛濮...
绛旓細[缂栬緫鏈]鐢靛鐨勮绠 鈶寸數闃 R 鈶犵數闃荤瓑浜庣數闃荤巼涔樹互锛堥暱搴﹂櫎浠ユí鎴潰绉級 R=蟻脳锛圠/S锛夆憽鐢甸樆绛変簬鐢靛帇闄や互鐢垫祦 R=U/I 鈶㈢數闃荤瓑浜庣數鍘嬪钩鏂归櫎浠ョ數鍔熺巼 R=U²/P 鈶电數鍔熸槸 W 鐢靛姛绛変簬鐢垫祦涔樼數鍘嬩箻鏃堕棿 W=UIt锛堟櫘閫氬叕寮忥級鐢靛姛绛変簬鐢靛姛鐜囦箻浠ユ椂闂 W=Pt 鐢靛姛绛変簬鐢佃嵎涔樼數鍘 W=UQ 鐢靛姛...
绛旓細鐢靛鍔熺巼鏄數璺腑鐨勫熀鏈墿鐞嗛噺涔嬩竴锛屽畠鐢ㄦ潵琛ㄧず鐢垫祦閫氳繃鐢佃矾鏃讹紝鐢佃兘琚浆鍖栦负鍏朵粬褰㈠紡鑳介噺鐨勯熺巼鎴栫巼銆傜數瀛﹀姛鐜囩殑鐗╃悊鍏紡涓篜=VI锛屽叾涓璓浠ｈ〃鐢靛鍔熺巼锛孷浠ｈ〃鐢靛帇锛孖浠ｈ〃鐢垫祦銆備互涓涓畝鍗曠殑鐢佃矾涓轰緥锛氫竴鍧楃數闃讳负R锛岄氳繃鐢靛帇涓篤鐨勭數娴両閫氬叆杩欎釜鐢佃矾銆傚湪杩欎釜鐢佃矾涓紝鐢垫祦I娴佽繃鐢甸樆R鏃讹紝浼氭秷鑰梀脳I鐨勭數鑳...
绛旓細鐢垫祦鐑噺璁＄畻鍏紡鏄淨=I²Rt鈥锛岃繖涓鍏紡鏄劍鑰冲畾寰嬬殑鏁板琛ㄨ揪寮忋傝繖涓叕寮忓彲浠ョ敤鏉ヨ绠椾换浣曠數娴侀氳繃浠讳綍鐢甸樆鍦ㄤ换浣曟椂闂存墍浜х敓鐨勭儹閲忋備緥濡傦紝浣犲彲浠ョ敤杩欎釜鍏紡鏉ヨ绠椾竴涓數鐑櫒鍦ㄧ粰瀹氱數娴佸拰鐢甸樆鐨勬儏鍐典笅锛岄渶瑕佸闀挎椂闂存墠鑳借揪鍒扮壒瀹氱殑娓╁害銆傜劍鑰冲畾寰嬫槸鐢靛涓殑涓涓熀鏈畾寰嬶紝瀹冩弿杩颁簡鐢佃兘涓庣儹鑳戒箣闂寸殑杞崲...
绛旓細杩欎釜鏈夐棴鍚堢數璺濮嗗畾寰嬪氨鍙互鎺ㄥ鍑烘潵锛屽叿浣撹繃绋嬪涓嬶細
绛旓細鐢垫祦I0=0锛岀浉褰撲簬璇ユ敮璺柇璺紝濡備笂鍥俱傚洜姝わ紝姝ゆ椂Z1鍜孼3灞炰簬涓茶仈鍏崇郴銆乑2鍜孼4涔熷睘浜庝覆鑱斿叧绯汇傚洜姝わ細I1=I3锛孖2=I4銆傚彟澶栦竴绉嶇悊瑙ｆ柟娉曪細瀵逛簬鑺傜偣B锛屾牴鎹甂CL锛屾祦鍑鸿妭鐐圭殑鐢垫祦=娴佸叆鑺傜偣鐨勭數娴侊紝鎵浠ワ細I1=I0+I3銆傝屾鏃讹紝I0=0锛屾墍浠ワ細I1=I3銆傚悓鏍峰浜庤妭鐐笵锛屾牴鎹甂CL涔熷彲浠ュ緱鍒帮細I2=I4銆
绛旓細1锛屜=Ep/q 鐢靛満涓煇鐐圭殑鐢靛娍=鍗曚綅姝ｇ數鑽峰湪璇ョ偣鐨勭數鍔胯兘 2锛孶(AB)=蠁(A)-蠁(B)=W锛圓B锛/q 鐢靛満涓瑼B涓ょ偣鐨勭數鍔垮樊=AB涓ょ偣鐢靛娍涔嬪樊=AB闂寸Щ鍔ㄥ崟浣嶆鐢佃嵎鐢靛満鍔涙墍鍋氱殑鍔 3锛學鍜孍锛堢數鍔胯兘鍜岀數鍦哄己搴︼級涔嬮棿鍒板簳鏄粈涔堝叧绯伙紵鍖寮虹數鍦轰腑锛歐=Fd=qEd ...
