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[例1]如图1所示的电路中,电源电动势和内阻一定,电阻R_1:R_2=1:3,K闭合前后R_1消耗的功率之比为4:3,则K闭合前后电源输出功率之比为多少?
[Example 1] In the circuit shown in Fig. 1, the power EMF and the internal resistance are constant, and the resistance R_1:R_2=1:3. The ratio of the power consumed by R_1 before and after K is closed is 4:3, then the power output power before and after K is closed. What is the ratio?