求八年级物理题(电功率等)
电阻是30欧的导体通过0.2A的电流时,电流做功120J,这个电阻两端的电压是( )V,通电时间是( )s,它的电功率是( )W.
人气:248 ℃ 时间:2019-10-23 02:29:39
解答
(1) U=IR=30*0.2=6V
(2)W=I^2Rt
t=W/(I^2R)=120/(0.04*30)=100s
(3)P=UI=6*0.2=1.2W
推荐
猜你喜欢
- 有don't do sth instead of doing的用法吗,怎么翻译?
- A successful team beats with one heart是什么意思
- he often___(relax) half a day
- 用作图法求直线斜率时,必须采用什么方法?
- Edward Smith is _____old.He works in a bank.
- 连词成句 threw,Li,Ming,the,ball,another,boy,to
- Lily doesn't want to buy__same present__Lucy did填空
- 麻烦您了,您帮我看看这道题呗 we see things by our eyes对么?为什么