人教版九年级第十八章电能与电功率测试题(无答案)
某段导体两端的电压是4V时,通过导体的电流是1A;如果将该导体两端的电压减少到2V时,通过导体的电流是
A.0.25A B.0.5A C.2A D.3A
单位时间内通过导体横截面的电量叫做()。
A.电压
B.电流强度
C.电阻
D.电功
A、导体截面积
B、电流
C、时间
D、电阻
下列关于电流强度的说法中正确的是()。
- A、通过导体横截面的电量越多,电流就越大
- B、通电时间越长,通过导体的电流就一定小
- C、导体的横截面积越大,通过导体的电量越大,导体中的电流就越大
- D、1s内通过导体横截面的电量越大,导体上的电流就越大
正确答案:D
单位时间为电流所做的功,称为()
- A、电量
- B、电功
- C、电动势
- D、电功率
正确答案:D
摘要:(www.)--两亿文档等你下载,什么都有,不信你来搜第九章电功电功率单元练习题(二)一、填空题1、在半分钟内通过某段导体的电量是18C,电流做了108J的功,那么导体两端的电压是V,导体的电阻是Ω。2、R1的电阻是484Ω,R2的电阻是1210Ω,串联后接入电路中,它们的电压之比为,电流之比为,在相等的时间内电流做功之比是。3、一个5Ω的电阻通过它的电流为2A,在10s内放出的热量是J,如果通过它的电流减小为原来的1/2,在相同的时间内放出的热量是原来的。4、某发电机输出功率为100kw,输出电压为250V,则输出电流为。5、一个定值电阻,接在3V的电源上,消耗的功率为0.6W,这个电阻的阻值是Ω,10min电流做功J。6、甲电动机在5s内做的功是1.5×104J,它做功的功率是W,乙电动机在1s内做功800J则电动机做功较快。7、一台大型发电机输出的电压是1.2×104V,输出的电流是1000A,这台发电机的输出功率是W,等于Kw。8、如图所示,电阻R、R、R接到电压为12V的电路中,电压表V的示数为6V,电压表V的示数为8V,电路消耗的总功率是2.4W,则电阻R=Ω,经过10s电阻R消耗的电功是W.9、把一个标有“6V3W”字样的灯泡接在电压为8V的电路中,并使灯泡正常发光,需要接入一个Ω的电阻,它与灯泡的连接方式是联。10、在1min时间内通过阻值为100Ω电阻的电量是120C,电流做功24000J,则这电阻两端的(www.)--两亿文档等你下载,什么都有,不信你来搜电压是V,这电阻消耗的
一个导体在1分钟内通过的电量为3000C,那么通过导体的电流是多少?
正确答案:I=Q/t=3000÷60=50A
每秒钟通过导体横截面的电量,称为()。
- A、电压
- B、电流
- C、电功
- D、电功率
正确答案:B
电压一定,电流通过金属导体,其电功与()成反比。
正确答案:电阻
电流通过导体时所做的功称为()。
- A、电源
- B、电功
- C、电压
- D、电阻
正确答案:B
电流通过导体时所作的功称为电功,电功的大小表示电能转换为其他形式能量的多少。
正确答案:正确
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