GEOLOGY

Detailed explanation-1: -In order for a current to flow, the circuit must be closed; in other words, there must be an uninterrupted path from the power source, through the circuit, then back to the power source. Voltage is sometimes called electric potential and is measured in volts.

Detailed explanation-2: -It’s just that if the circuit is not closed then charge accumulates and eventually cancels out the applied electric field at which point charges stop flowing. This happens very fast and is not of much interest in most technology. Save this answer.

Detailed explanation-3: -Current only flows through closed circuit paths because, in acordance with Law of conservation of charges, the number of electrons flowing from voltage source to the circuit should be equal to number of electrons flowing from circuit to the voltage source.

Detailed explanation-4: -The direction of flow of current is opposite to the direction of flow of electrons. Hence, in a closed circuit, electrons flow from the negative terminal to the positive terminal of a cell.