填空题:图9--11是闭合电路的U—I图线.由图可知,闭合电路中电源的电动势E=__________V,电源的内阻r=_____

题目内容:
图9--11是闭合电路的U—I图线.由图可知,闭合电路中电源的电动势E=__________V,电源的内阻r=__________Ω.当路端电压U=2.5V时,外电阻R=__________Ω.

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