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厦门渤格电气技术有限公司

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厦门渤格电气技术有限公司是一家专业提供工业自动化领域的备件服务商,产品品种齐全、价格合理,公司实力雄厚,重信用、守合同、保证产品质量,以多品种经营特色和薄利多销的原则,赢得了广大客户的信任。 我们主营PLC可编程控制器模块,DCS卡件,ESD系统卡件,振动监测系统卡件,汽轮机控制系......

1769OB32 1746NIO4I

产品编号:614719132                    更新时间:2019-05-17
价格: 来电议定
厦门渤格电气技术有限公司

厦门渤格电气技术有限公司

  • 主营业务:AB,ABB,GE,本特利,福克斯波罗,霍尼韦尔,英维斯,西...
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Rockwell Allen-Bradley 1769OB32 1746NIO4I

  1.焦耳定律定义:
    电流通过导体时所产生的热量Q,跟电流的平方成正比,跟导体的电阻成正比,跟通电的时间成正比。
    2.焦耳定律公式:
    Q=I2Rt,适用范围:任何电路。
    控制变量法:
    (1)控制电流和电阻相同,研究电热与通电时间的关系
    (2)控制通电时间和电阻不变,改变电流的大小,研究电热与电流的关系
    (3)控制通电时间和电流不变,改变电阻大小,研究电热与电阻的关系
    串并联电路电热关系:
    串联电路中,电热之比等于电阻之比,
    并联电路中,电热之比等于电阻的反比
    “焦耳定律”中的控制变量法:
    焦耳定律的实验运用了控制变量法,当两段电阻串联时,控制电流和通电时间相同,得出电***生的热量与电阻大小有关,当两电阻并联时,控制电阻和通电时问不变,得出电***生的热量与电流大小有关。
    例:小宇和小刚想利用如图所示的装置来探究“导体产生的热量与其电阻大小的关系”。两只相同的烧瓶中装有适量的煤油,烧瓶A中浸泡着一段铜丝,电阻较小;烧瓶B中浸泡着一段镍铬合金丝,电阻较大,温度计显示煤油的温度。
    (1)为保证实验科学合理,两个烧瓶中所装煤油的质量应该相同。
    (2)实验中,小字和小刚发现B烧瓶中温度计的示数升高得快。这表明:在电流和通电时间相同的情况下,导体的电阻越大,产生的热量越多。
    解析:(1)利用控制变量法在探究“导体产生的热量与其电阻大小的关系”时应控制其他因素不变,如煤油的质量,相同的烧瓶,相同的温度计等。
    (2)B瓶中温度计升高得快,说明相同时间内煤油吸收的热量多,由于镍铬合金丝电阻大于铜丝电阻,所以在电流和通电时间相同时,导体电阻越大,产生的热量越多。
 
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