Step 1:

Find the voltage across the terminal B and D.

Find the current flowing across the terminal B and D.

Apply KVL to the loop 1.

Step 2:

The voltage across the terminal B and D : .

The voltage across the terminal B and D is .

Solution :

The voltage across the terminal B and D is .

Step 1:

Find the voltage across the terminal C and F.

Apply KVL equation for the voltage between C and F.

.