阻值为 R 的两个电阻串联接在电压为 U 的电路中,每个电阻消耗的功率为 P ;若将两个电阻改为并联,仍接在电压为 U 的电路中,则每个电阻消耗的功率为( )。
A.
P
B.
2P
C.
4P
D.
P/2
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