题目内容
4个电阻,电阻值都是R,把它们并联起来,总电阻是( )
| A.4R | B.
| C.
| D.2R |
四个电阻并联,则
=
+
+
+
=
,则R并=
;
故选B.
| 1 |
| R并 |
| 1 |
| R |
| 1 |
| R |
| 1 |
| R |
| 1 |
| R |
| 4 |
| R |
| R |
| 4 |
故选B.
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题目内容
| A.4R | B.
| C.
| D.2R |
| 1 |
| R并 |
| 1 |
| R |
| 1 |
| R |
| 1 |
| R |
| 1 |
| R |
| 4 |
| R |
| R |
| 4 |