表一是某電熱水壺的銘牌;表二是小紅探究該電熱水壺效率所記錄的數(shù)據(jù)。
表一: 表二:
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求:(1)電熱水壺的電阻。
(2)當(dāng)電熱水壺實際工作電壓為110V時,它的實際功率。
(3)電熱水壺的效率。[c水=4.2×103J/(kg·℃)]
(1)····································································· 1分
···························································· 1分
································································· 1分
(2)解法一:
··························································· 1分
······················································ 1分
··································································· 1分
解法二:
3分
(3)
······························································ 1分
··········································································· 1 分
科目:初中物理 來源: 題型:
產(chǎn)品型號 | SWF12P1A-150 |
額定電壓U/V | 220 |
電源頻率f/Hz | 50 |
額定功率P/W | 1200 |
容量V/L | 1.2 |
電源電壓U電/V | 220 |
壺內(nèi)水的質(zhì)量m/kg | 1 |
水的初溫t1/℃ | 33 |
水的沸點t2/℃ | 98 |
水從初溫加熱至剛沸騰的時間t/s | 250 |
查看答案和解析>>
科目:初中物理 來源:2013年初中畢業(yè)升學(xué)考試(福建龍巖卷)物理(帶解析) 題型:計算題
表一是某電熱水壺的銘牌;表二是小紅探究該電熱水壺效率所記錄的數(shù)據(jù)。
表一:
表二:
求:(1)電熱水壺的電阻。
(2)當(dāng)電熱水壺實際工作電壓為110V時,它的實際功率。
(3)電熱水壺的效率。[c水=4.2×103J/(kg·℃)]
查看答案和解析>>
科目:初中物理 來源:2013年初中畢業(yè)升學(xué)考試(福建龍巖卷)物理(解析版) 題型:計算題
表一是某電熱水壺的銘牌;表二是小紅探究該電熱水壺效率所記錄的數(shù)據(jù)。
表一:
表二:
求:(1)電熱水壺的電阻。
(2)當(dāng)電熱水壺實際工作電壓為110V時,它的實際功率。
(3)電熱水壺的效率。[c水=4.2×103J/(kg·℃)]
查看答案和解析>>
科目:初中物理 來源:2013年福建省龍巖市中考物理試卷 (解析版) 題型:解答題
產(chǎn)品型號 | SWF12P1A-150 |
額定電壓U/V | 220 |
電源頻率f/Hz | 50 |
額定功率P/W | 1200 |
容量V/L | 1.2 |
電源電壓U電/V | 220 |
壺內(nèi)水的質(zhì)量m/kg | 1 |
水的初溫t1/℃ | 33 |
水的沸點t2/℃ | 98 |
水從初溫加熱至剛沸騰的時間t/s | 250 |
查看答案和解析>>
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