挑战习题
1
/5
单选题
难度:
1.
两条电阻丝串联在电路中,在相同的时间内产生的热量较多的是( )
A
通过电流较大的电阻丝
B
两端电压较小的电阻丝
C
两端电压较大的电阻丝
D
电阻较小的电阻丝
提示1:
PHA+5qC55o2uUT1JPHN1cD4yPC9zdXA+UnTvvIzlj6/nn6XlvZPnlLXmtYHlkozpgJrnlLXml7bpl7Tnm7jlkIzml7bvvIznlLXpmLvotorlpKfvvIzkuqfnlJ/nmoTng63ph4/otorlpJo8L3A+
正确答案:
Qw==
PHA+5Zyo5Liy6IGU55S16Lev5Lit77yM5qC55o2u5YWs5byPVT1JUuWPr+efpe+8jOeUtemYu+i2iuWkp++8jOeUtemYu+S4pOerr+eahOeUteWOi+Wwsei2iuWkp++8jOWcqOebuOWQjOeahOaXtumXtOWGheS6p+eUn+eahOeDremHj+Wwsei2iuWkmu+8juaVhemAiUPvvI48L3A+
2
/5
单选题
难度:
2.某导体的电阻是2Ω,通过2A的电流时,1min产生的热量为( )
A
480 W
B
480 J
C
8J
D
8W
提示1:
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正确答案:
Qg==
Uj0yzqnvvIx0PTFtaW49NjBz77yM5YiZUT1JPHN1cD4yPC9zdXA+UnQgPe+8iDJB77yJPHN1cD4yPC9zdXA+w5cyzqnDlzYwcz00ODBK77yO5pWF6YCJQu+8jg==
3
/5
单选题
难度:
3.在“探究焦耳定律”的实验中.为了找出电流做功产生的热量与电阻的关系,必须同时保持( )
A
电阻相等和电流相等
B
电阻相等和通电时间相等
C
通电时间相等和电流相等
D
电阻相等、通电时间相等、电流相等
提示1:
54Sm6ICz5a6a5b6L5Lit5raJ5Y+K5YiwNOS4queJqeeQhumHj++8jOaIkeS7rOWPr+S7pemHh+WPluaOp+WItuWPmOmHj+azleadpeeglOeptuS4pOS4queJqeeQhumHj+S5i+mXtOeahOWFs+ezuw==
正确答案:
Qw==
55SxUT1JPHN1cD4yPC9zdXA+UnTnn6XvvIznlLXmtYHpgJrov4flr7zkvZPmiYDkuqfnlJ/nmoTng63ph4/kuI7lr7zkvZPkuK3nmoTnlLXmtYHjgIHnlLXpmLvlj4rpgJrnlLXml7bpl7TmnInlhbPvvIzmjqLnqbbnlLXmtYHkuqfnlJ/nmoTng63ph4/kuI7nlLXpmLvnmoTlhbPns7vvvIzpnIDmjqfliLbnm7jlkIznmoTnlLXmtYHlkoznm7jlkIznmoTpgJrnlLXml7bpl7TvvIzlubbpgInnlKjkuI3lkIznmoTnlLXpmLvkuJ3vvI7mlYXpgIlD77yO
4
/5
单选题
难度:
4.标有“2400Ω 40W”和“2400Ω 20W”的两个定值电阻,串联起来接在220V的电路上,则它们在相同的时间内产生的热量之比为 ()
A
1:2
B
.2:1
C
1:1
D
.1:4
提示1:
5Liy6IGU55S16Lev5Lit77yM55S16Zi75Lqn55Sf55qE54Ot6YeP5ZKM55S16Zi76Zi75YC85oiQ5q2j5q+U
正确答案:
Qw==
5Zyo5Liy6IGU55S16Lev5Lit77yM55S16Zi75Lqn55Sf55qE54Ot6YeP5ZKM55S16Zi755qE6Zi75YC85oiQ5q2j5q+U77yM5Zug5Li6UjxzdWI+MTwvc3ViPu+8mlI8c3ViPjI8L3N1Yj49MTox77yM5omA5LulUTxzdWI+MTwvc3ViPu+8mlE8c3ViPjI8L3N1Yj49MTox77yM5pWF6YCJQy4=
5
/5
单选题
难度:
5.将阻值为R的电阻丝接人电压为U的电路中,通电10min,电流产生的热量为Q。将阻值为2R的电阻丝接入电压为2U的电路中,通电5min,电流产生的热量是()
A
2Q
B
Q
C
Q/2
D
Q/4
提示1:
5qC55o2uUT1JPHN1cD4yPC9zdXA+UnTvvIzlsIblt7Lnn6Xph4/liIbliKvluKblhaXvvIzkvr/lj6/ku6XlvpfliLDng63ph4/kuYvpl7TnmoTlhbPns7s=
正确答案:
Qg==
55Sx5bey55+l5Y+v5b6X77yM55S16Zi75LmL5q+U5Li6MToy77yM55S15Y6L5LmL5q+U5Li6MToy77yM6YCa55S15pe26Ze05LmL5q+U5Li6MjoxLO+8m+agueaNruasp+WnhuWumuW+i+WPr+W+l+eUtea1geS5i+avlOS4ujE6Me+8m+agueaNrlE9STxzdXA+Mjwvc3VwPlJ077yM5bCG55S16Zi75LmL5q+U44CB55S15rWB5LmL5q+U5ZKM6YCa55S15pe26Ze05LmL5q+U5bim5YWl5YWs5byP5Y+v5Lul5b6X5Yiw5Lqn55Sf54Ot6YeP5LmL5q+U5Li6MTox77yM5Y2zUeKAmT1R77yM5pWF6YCJQi4=