中考物理试题分项解析汇编专题《电功率和电热安全用电(二)》含解析

中考物理试题分项解析汇编专题《电功率和电热安全用电(二)》含解析

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39ᑐᜮ!_ᧇᡭ5᜜y¡ᙊ£¤¥Ḅᵯ9!ᵯ9Ḅ¦ᓄᵯ1᝞¨ᡠ,ªᐵS]ᑗᣚX9#J®¥᝱!Rஹ°y±9ᵯ'!Ḅ²⌕´ᦪ᝞Z⊤஺·Zᑡ¹⚪^_஺>?ᵯ@஺ᡭabc஺ᵯ%bcJYP-P10220VPᵯdA᳛Q0%A᳛஺fCA᳛/180W^1000WP242W-(1)º»ᔣXᐭ¾#¿Àᐳ1.0kg,ᡭÂᡂ>ḄÃJ640࠷,X9ÄÅᐸJKᓣIᑮ100࠷,◤⌕ᔾᦈËÌ9Í—Î[ÐÄḄ°9Ñ64.0Xl()3j/(kg.p)](2)ᵯ'R#R2Ḅ'ØᑖÙ6Ëᜧ?(3)Ä□Û/ᜐÝᡭ#X9/!ÞbIminᡠáὑᵯã6Ëᜧ?I~^6----------Ia?220V|R,I—CZD-(ZZJ-1ᵬ¨[]äåḕçèé2018ὃᱥᳮê⚪ூᫀ௃2.4X105J48.4Q151.6Q70800Jூ᪆௃(D0%ia◤⌕ᔾᦈḄ%FQ-=cm(t-tj)=4.0xl0»=cm(t-to)DX9Ä◤⌕ᔾᦈḄ9Í5(2)ᵫò!,Sóa/!ᵯ1õᨵRi,U2ᵯ'÷4!ᵫP=R]ò!ø/ᵯ;᳛÷ᜧ!6X9᫏5,Sób/!ᵯ1RஹR2*ὶ!ᵯ'÷ᜧ!ᵫPU2U2=ᜩ]ò!ø/ᵯ;᳛÷4!6J᫏5ᑭᵨP=ᐗDR|ஹRþ5ÿᑭᵨὶᵯḄᱯR2(3)□ᜐᡭ!"᳛$ᑭᵨW=Pt)*+,Iminᡠ2ὑᵯ4஺58.ᙠᱥᳮ<ᔠ>?@ABCDCEᔠ,FGᵯHᮤḄᦔ᳛஺KLᐵNOBḄᐸKᵨᵯᘤRS

40ᵯHᮤTᐭᵯVBWXXḄYGZ[g஺CD]^_`ᵯ4⊤(᝞c)CE]^ᵨdefFGXḄde஺5minᵯ4⊤gḄhihj200r,XḄdeាoᓣqj50࠷஺stᑡv⚪xyIBEZI-I--ZBIJ(1)XᔾᦈḄG}~[CX=4.2x103J/(kg-࠷)](2)ᵯHᮤḄ>▭"᳛}~(3)ᵯHᮤWXḄᦔ᳛}~[]ḕ2018Bὃᱥᳮ⚪ூᫀ௃4.2X10Z2000W70%ூs᪆௃ᑖ᪆x(1)⍝XḄYGஹdeᓄ¡¢᪷¤ஹᔾ;0^^XᔾᦈḄG(2)1200r/kW-h⊤¨ᵨᵯᘤ©2ὑIkMhᵯ4ᵯ4⊤⊤ihA1200ᙌ¤¬h200r2ὑḄᵯ4WP=—᪷¤t2minBᵯX>▭"᳛஺Qᔾn=—X100%(3)᪷¤ᦔ᳛°±²f³ᦔ᳛஺sx(DXᔾᦈḄGa®=cznAt=42X103J/(kg■࠷)x2kgX50࠷=4.2x105J.200,,W6x105JW=------x3.6x106J=6x105JP=¼=-------=2000W(2)ᵯHᮤ2ὑḄᵯ41200,ᵯHᮤḄ>▭"᳛t5x60sQᔾ4.2x105Jr)=--=----------=70%(3)ᵯHᮤWXḄᦔ᳛W6x10"஺ᦑᫀZxপ4.2x105/;(2)2000IV;(3)70%oூÃ௃Ä⚪ὃÅjᔾ°±ᵯ"°±ஹᵯ"᳛°±ḄÆᵨÇ⚪ᦻBÉÊᨵᵨḄÌÍ}ᐵÎ஺59.©ᜩÑÒᨵÓ~ᐰÕᔜᙢḄØÙÚÛᩭᑮᜩÞßàá_âᓣÕãä±஺ᜩÞßàágḄÕã©ᜩÑÒåæ□¼çᓣç25000èéᜫë஺ì}íîÕãḄᡊðL¼ᜩ¼ñòóôò¼ñõö÷Ḅøùú⌼Ḅ᜻ý஺ᜩÞßàágḄÕã!þZ175N,ᓣ(᝞)ᓣ30m,ᡠᵨ2ᑖ07஺ᑡ⚪

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