本课配套习题挑战模式1/5
单选题
难度系数:
1.下列用电器中,利用电流热效应工作的是( )
A: 电脑 |
B: 电热水壶 |
C: 洗衣机 |
D: 电风扇 |
一次做对,真牛!
+5奖励规则>
- 提示1:5piO56Gu55So55S15Zmo55qE55So6YCU5piv6Kej562U5pys6aKY55qE5YWz6ZSu
- 答案:Qg==
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
本课配套习题挑战模式2/5
单选题
难度系数:
2.电流通过导体产生的热量为Q=I2Rt,这个规律是下面哪位科学家发现的()
A: 奥斯特 |
B: 焦耳 |
C: 欧姆 |
D: 法拉第 |
一次做对,真牛!
+5奖励规则>
- 提示1:UT1JPHN1cD4yPC9zdXA+UnTvvIzmmK/noJTnqbbnlLXng61R5LiO55S15rWB44CB6YCa55S15pe26Ze044CB55S16Zi75LmL6Ze05YWz57O755qE5byP5a2Q77yM5pyA5pep5Y+R546w6L+Z5Liq6KeE5b6L55qE56eR5a2m5a625piv54Sm6ICz
- 答案:Qg==
55S15rWB6YCa6L+H5a+85L2T5Lqn55Sf55qE54Ot6YeP5Li6UT1JPHN1cD4yPC9zdXA+UnTvvIzmmK/nhKbogLPlrprlvovnmoTlhoXlrrnvvIzmmK/nhKbogLPlj5HnjrDnmoTvvI7mlYXpgIlC77yO
本课配套习题挑战模式3/5
单选题
难度系数:
3.灯泡发光时,灯丝的温度达到2000℃,而与灯丝相连的导线却不那么热,这是因为( )
A: 通过灯丝的电流比通过导线的电流大得多 |
B: 相同长度灯丝的电阻比导线的电阻大得多 |
C: 灯丝被密封在灯泡里不散热 |
D: 灯丝做成螺旋形状,不容易散热 |
一次做对,真牛!
+5奖励规则>
- 提示1:5Liy6IGU55S16Lev5Lit77yM55S16Zi75YC86LaK5aSn77yM55u45ZCM5pe26Ze05YaF77yM6K+l55S16Zi75Lqn55Sf55qE54Ot6YeP6LaK5aSa
- 提示2:54Gv5Lid55qE55S16Zi75YC86L+c6L+c5q+U5a+857q/55qE55S16Zi75YC85aSn77yM5omA5Lul5b2T5Lik6ICF5Liy6IGU5pe277yM54Gv5Lid5Zyo55u45ZCM5pe26Ze05YaF5Lqn55Sf55qE54Ot6YeP5aSa
- 答案:Qg==
5Zug5Li654Gv5LiO5a+857q/5Liy6IGU77yM5omA5Lul6YCa6L+H55qE55S15rWB55u4562J44CB6YCa55S15pe26Ze055u4562J77yM5Zug5Li6UT1JPHN1cD4yPC9zdXA+UnTvvIxSPHN1Yj7nga88L3N1Yj7vvJ48YnI+UjxzdWI+5a+857q/PC9zdWI+77yM5omA5Lul55S15rWB5Zyo54Gv5Lid5LiK5Lqn55Sf55qE54Ot6YeP5q+U5a+857q/5LiK5Lqn55Sf55qE54Ot6YeP5aSa77yM5Lqn55Sf54Gv5Lid55qE5rip5bqm6L6+5YiwMjAwMOKEg++8jOiAjOS4jueBr+S4neebuOi/nueahOWvvOe6v+WNtOS4jemCo+S5iOeDreeahOeOsOixoe+8jueUseS4iui/sOWPr+efpemAiemhuUHjgIFD44CBROmDveS4jeato+ehru+8juaVhemAiULvvI4=
本课配套习题挑战模式4/5
单选题
难度系数:
4.两电热丝的阻值之比为R1:R2=2:3,通过的电流之比为I1:I2=3:2,在相同的时间内它们放出的热量之比Q1:Q2是( )
A: 3:2 |
B: 1:1 |
C: 27:8 |
D: 4:9 |
一次做对,真牛!
+5奖励规则>
- 提示1:5Yip55So5YWs5byPUT1JPHN1cD4yPC9zdXA+UnTvvIzlsIbkuKTkuKrnlLXpmLvkuJ3nmoTnlLXpmLvlgLzkuI7nlLXmtYHlgLzkuYvmr5TluKblhaXlhazlvI/vvIzkvr/lj6/ku6XlvpfliLDkuKTkuKrnlLXpmLvkuJ3kuqfnlJ/nmoTng63ph4/kuYvmr5Q=
- 答案:QQ==
55SxUT1JPHN1cD4yPC9zdXA+UnTvvIxRPHN1Yj4xPC9zdWI+PUk8c3ViPjE8L3N1Yj48c3VwPjI8L3N1cD5SPHN1Yj4xPC9zdWI+dO+8jFE8c3ViPjI8L3N1Yj49STxzdWI+Mjwvc3ViPjxzdXA+Mjwvc3VwPlJ077yM5bCGUjxzdWI+MTwvc3ViPu+8mlI8c3ViPjI8L3N1Yj49Mu+8mjPvvIxJPHN1Yj4xPC9zdWI+77yaSTxzdWI+Mjwvc3ViPj0z77yaMuW4puWFpeWQhOiHqueahOWFrOW8j+S4re+8jOW+l+WIsFE8c3ViPjE8L3N1Yj7vvJpRPHN1Yj4yIDwvc3ViPj0zOjLvvIzmlYXpgIlBLg==
本课配套习题挑战模式5/5
单选题
难度系数:
5.某同学家的1000W电炉子突然灭了,检查发现电炉丝烧断了,他把烧坏的地方剪掉一小段再接入电路,则电炉子1s内产生的热量将( )
A: 大于1000J |
B: 小于1000J |
C: 等于1000J |
D: 无法确定 |
一次做对,真牛!
+5奖励规则>
- 提示1:5oqK55S154KJ5Lid54On5Z2P55qE5Zyw5pa55Ymq5o6J5LiA5bCP5q615YaN5o6l5YWl55S16Lev77yM55S154KJ5Lid55qE5p2Q5paZ44CB5qiq5oiq6Z2i56ev5LiN5Y+Y6ICM6ZW/5bqm5Y+Y55+t77yM6Zi75YC85Y+Y5bCP
- 答案:QQ==
5oqK55S154KJ5Lid54On5Z2P55qE5Zyw5pa55Ymq5o6J5LiA5bCP5q615YaN5o6l5YWl55S16Lev77yM55S154KJ5Lid55qE5p2Q5paZ44CB5qiq5oiq6Z2i56ev5LiN5Y+Y6ICM6ZW/5bqm5Y+Y55+t77yM5a+85L2T55S16Zi7UuWPmOWwj++8jOeUtea6kOeUteWOi1XkuI3lj5jvvIznlLFQPVU8c3VwPjI8L3N1cD4gL1Ig77yM5Y+v55+l77yM55S154KJ5a2Q55qE55S15Yqf546H5Y+Y5aSn77yM5aSn5LqOMTAwMFfvvIznlLFXPVB05Y+v55+l77yM55S154KJ5a2Q5ZyoMXPlhoXkuqfnlJ/nmoTng63ph4/lpKfkuo4xMDAwSu+8jOaVhemAiUHvvI4=