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图示电路中电阻R吸收的功率P等于( )。
·3W
·4W
·9W
·12W<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/16337615111074cf79f0ac3ad48c19f96cdcda412836eimage4.png"
·3W
·4W
·9W
·12W<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/16337615111074cf79f0ac3ad48c19f96cdcda412836eimage4.png"
参考答案
