In an electric circuit, a cell of certain emf provides a potential difference of 1.25 V across a load resistance of 5 Ω. However, it provides a…

In an electric circuit, a cell of certain emf provides a potential difference of $\displaystyle 1.25$ V across a load resistance of $\displaystyle 5 \Omega$. However, it provides a potential difference of $\displaystyle 1$ V across a load resistance of $\displaystyle 2 \Omega$. The emf of the cell is given by $\displaystyle \frac{x}{10} \mathrm{~V}$. Then the value of $\displaystyle x$ is \_\_\_\_.