[单选题]
In the circuits below, alli :d,jx.( (hgj fyt;ag resistors have the sam 1a*2kp)nhxo be resistance, and the cells do not have 1b h)ok*nxp2a internal resistance. The emf of the cell in circuit 1 is $E_1$ while it is $E_2$ in circuit 2.
All resistors dissipate the same power. Which of the following gives the ratio $\frac{E_1}{E_2}$