Voltage without Current? Current without Voltage? 

Let's explain with a waterfall as an example: Water falling from the high point to the low point of the waterfall is like electrons flowing through a conductor. The height difference is the potential difference & the water flowing is the current. When one point is more electrically charged than the other, there forms a voltage (Potential difference). Now, consider, If there is no water in the waterfall then there is no Current, but, the difference between the two points is still there... That is potential difference exists. That's voltage without current. If the voltage was zero, ie, if the highest point and lowest point of the waterfall were on the same level, would water still fall flow? No, water would stay still. That is no current without voltage. But wait... Both voltage without current and current without voltage are theoretically possible. Voltage without current: This situation can occur when a potential difference exists between two points in a circuit, but there is no path for current to flow. For example, if you have a battery connected to an open circuit, there will be a voltage across the terminals, but no current will flow until a complete circuit is formed. Current without voltage: This situation can occur in certain conditions, such as when a current flows in a superconductor. Superconductors can carry current without any voltage drop across them, due to their unique properties at low temperatures. Additionally, in certain types of electrical phenomena, such as transient currents or induction currents, current may flow momentarily without the presence of an external voltage source.