资源简介

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参考答案
一、选择题
1. B
2. C
3. D
4. A
5. D
6. D
7. B
8. D
9. D
10. C
二、填空题
11. 做功冲程；乙
12. 无规则运动；引力
13. 比热容；40℃
14. 4V；1V；不变
15. 2.4V；6Ω；6Ω
16. 100℃；10Ω
17. (1) 手指飞向水龙头
(2) 猫毛和手指摩擦产生静电，手指靠近猫鼻子时，静电放电产生火花
三、实验探究题
18. (1) 加热时间
(2) a；b
(3) a
19. (1) 略
(2) B
(3) 电阻 R断路
(4) 在电阻一定时，通过导体的电流与导体两端的电压成正比；10Ω
(5) 0.4A
【拓展】6V
四、计算应用题
20. (1) 1.8×10 Pa
(2) 880N
(3) 3.6kg
21. (1) 变小
(2) 0.3A
(3) 2.5Ω-20Ω
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