For the sustained flow of charge in a wire, an analogous condition is the continuous movement of water in a pipe, where the pipe needs to be unobstructed and there must be a constant pressure or voltage difference to drive the flow. In the case of electrical current, the wire must be unbroken and there must be a continuous voltage (potential difference) provided by a source such as a battery.
For example, you can make an analogy with the flow of water in a tube.
The necessary condition for the sustained flow of charge in a wire is the presence of a closed circuit or path for the current to flow in. This closed path allows the charges to continuously move and circulate through the wire. Additionally, an external source of electromotive force, such as a battery or a power supply, is required to provide the energy needed to maintain the flow of charge.
In order for charge to flow, there must be a potential difference present across a conductor. This difference in electric potential creates an electric field that drives the movement of charge through the material.
A potential difference, or voltage, is necessary for a sustained flow of electric charge through a conducting medium. This potential difference creates an electric field that pushes the charges through the conductor. Without a potential difference, the charges will not move and no current will flow.
A potential difference (voltage) across the conducting medium is necessary for a sustained flow of electric charge. This potential difference creates an electric field that pushes the charges through the conductor. Without a potential difference, there would be no force to maintain the flow of charges.
The necessary condition for a charge to move in a wire is the presence of an electric field, which exerts a force on the charge causing it to move. This movement of charges in a wire is what constitutes an electric current.
Electric force depends on the charge of the objects involved, analogous to mass in gravitational force. The greater the charge of the objects, the stronger the electric force between them.
A charge in motion is usually called an electric current, but could also be called dynamic electricity (analogous to a charge at rest being called static electricity).
Why is the wet-bulb reading necessary when checking the charge
An individual square of a charge coupled device is analogous to a pixel in a digital image sensor. Each square, or pixel, in a CCD is responsible for detecting and converting incoming light into electrical signals, much like how pixels capture and display visual information in digital images.
For electric charge to flow, there must be a potential difference (voltage) between two points in a conducting material. This difference in potential creates an electric field that exerts a force on the charges, causing them to move. Without a potential difference, charges will not flow.