# Is it possible to have current flow between points that have the same potential?

## Is it possible to have current flow between points that have the same potential?

If we connect two equipotential points with a wire, the potential difference across the wire is zero, assuming the two points remain at the same potential after connection. The zero potential difference means there is no (external) electric field to move the electrons, hence, no current flows.

### Why current does not flow without potential difference?

Without potential difference, current can not flow because we know that an electric current flows between two points due to the potential difference between them. Thus, as long as the potential difference is maintained between the two points, the electric current keeps flowing continuously.

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#### What happens when two points are at same potential?

Since there is no change in potential, dV/dr = 0. Hence, electric intensity in the region is zero.

Why does current not flow along equipotential lines?

The curves along which the electric potential V is constant are called equipotential lines. Furthermore, since current flows in the direction of the electric field, and equipotential lines are everywhere perpendicular to this direction it follows that no current flows along lines of equipotential.

What device measures current flow?

ammeter
The electric current in one part of a circuit is measured with an ammeter, which gives a reading in ampere. To take the measurement, a gap is made in the circuit and the ammeter is connected into that gap, so that the charged particles moving around the circuit must pass through the meter.

## Can potential difference exist without current?

Can voltage exist without current? Yes, it can. If the voltage is absent, those electrons cannot move between points in a circuit, which means that the current does not exist. However, the voltage is still present because you have a circuit with points whose electrical potential varies.

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### Is potential difference between different points of the circuit same or different?

The potential difference (which is the same as voltage) is equal to the amount of current multiplied by the resistance. A potential difference of one Volt is equal to one Joule of energy being used by one Coulomb of charge when it flows between two points in a circuit.

#### Can two points have the same potential in a uniform electric field?

no two points can have the same potential.

Why do electric field lines do not cross each other?

The direction of electric field line generally changes from point to point and hence are curved lines. And this implies two directions of electric field intensity at the point of intersection, which is not possible. Hence, two field lines never cross each other.

Will current flow through a short circuit with no potential difference?

When there is no potential difference in the circuit, then no current will flow. But in the case of a short circuit, will the current flow? In this circuit both the ends of the resistor is connected to + 5V .Since there is no potential difference,the current flowing through the circuit will be zero.

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## What is the potential difference between two points in a circuit?

Since the first branch has no resistance, according to V=IR, the potential difference between the points is zero and hence no charge will flow through the two points and all charges will take the second path. \$\\begingroup\$ The common answer is for two resistors in parallel, where one resistor has value 0.

### What happens if the resistance of a short circuit is zero?

If the resistance becomes zero (i.e short circuit) the current will still not flow as there is no potential difference. In this circuit the resistance is zero hence short ciruit. One of the end is connected to +5V and other to the ground. So the potential difference turns out to be 5V.

#### Is potential difference required for flow of charges from one point?

MY REASONING : My book states that a potential difference is required for the flow of charges from one point to another. Since the first branch has no resistance, according to V=IR, the potential difference between the points is zero and hence no charge will flow through the two points and all charges will take the second path.