串联电路中有R1=2Ω,R2=4Ω,R3=1Ω三个电阻,当电源电压为14V时,电路中的电流为()。A、6AB、4AC、3AD、2A

串联电路中有R1=2Ω,R2=4Ω,R3=1Ω三个电阻,当电源电压为14V时,电路中的电流为()。

  • A、6A
  • B、4A
  • C、3A
  • D、2A

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