Formula formula icon Series circuits: The electric potential across the battery is equal to the sum of the electric potential across each resistor. Vbattery = V1 V2 V3 Parallel circuits: The electric potential is the same in all parts of the circuit. V1 = V2 = V3 = V4 Now you will take these two rules about electric potential and apply them to some simple circuits and mix circuits. battery 0.15a electric potential 3.0v