Answer:
Voltage
Step-by-step explanation:
Charges cannot flow without voltage which is also known as electromotive force. The electromotive force is known to be the driving force for current in an electric circuit. This emf or battery is the source voltage that has both positive and negative terminals. Current flows from out from the positive terminal of the battery. This means that the arrangement of the polarity of the battery determines the direction of flow of the electric current through an electric circuit. The flow of current in a DC circuit is in one direction i.e either clockwise or anticlockwise.