Why current does not flow in a wire without battery?
4 Answers. It takes very few electrons to establish a charge. Yes, when you connect a wire to the positive terminal of a battery some electrons will flow from the wire to the battery to charge the wire. It isn’t many and it happens quickly, so a meter won’t show it.
Can current flow from one battery to another?
Electric Currents in Batteries We learned Ohm’s law, which told us that electric current flows from a positive to a negative electric potential while the electrons move in the opposite direction. The answer could be obvious: Ohm’s law alone cannot explain what happens inside a battery.
Is there current through a battery?
A battery maintains a nearly constant change in electric potential across its terminals. When a complete circuit is connected from one terminal to the other, there is an electric current. Of course this current isn’t for “free”. It takes energy to move this current through a circuit.
Can current flow in a wire with free end?
In order to have a current flow, there must be a complete circuit and there cannot be a difference in gravitational potential around a closed loop. Similarly, we can not expect any current in a hanging wire with its ends at two different gravitational potentials .
What happens to the current in a battery?
During the discharge of a battery, the current in the circuit flows from the positive to the negative electrode. According to Ohm’s law, this means that the current is proportional to the electric field, which says that current flows from a positive to negative electric potential. But what happens inside the battery?
When do electrons flow in the same direction in a battery?
When a battery or power supply sets up a difference in potential between two parts of a wire, an electric field is created and the electrons respond to that field. In a current-carrying conductor, however, the electrons do not all flow in the same direction.
How does a battery charge and discharge work?
Batteries put out direct current, as opposed to alternating current, which is what comes out of a wall socket. With direct current, the charge flows only in one direction. With alternating current, the charges slosh back and forth, continually reversing direction. The Duracell web site has a nice explanation of how batteries work.
What is the current flow of a 3 V battery?
The voltage across the resistor is thus 3 V and so, the current through the resistor is, by Ohm’s law, 3 A. Assuming you have no problem with the above, take the next step and replace the 3 V cell with a 3 V battery consisting of three 1 V cells in series.