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Reviewed CSCA Physics question · Easy

两个电阻 R1 = 6 Ω 和 R2 = 3 Ω 并联后，接到电压为12 V的电源两端。求通过 R2 的电流大小。

  1. 2 A
  2. 3 A
  3. 4 A
  4. 6 A
Show the answer and explanation

Correct answer

C. 4 A

Principle or equation

并联电路各支路电压相等，等于电源电压。由欧姆定律 I = U/R 计算各支路电流。

Why this answer is correct

R2 两端电压为12 V，所以通过 R2 的电流 I2 = U/R2 = 12/3 = 4 A。

Example

若 R1=4 Ω，R2=6 Ω，电压为12 V，则通过 R2 的电流为2 A。

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