Can there be current without voltage

Current tends to move through the conductors with some degree of friction or opposition to motion. For instance if you have a single charge that charge induces a voltage in space even if its empty.

What we measure as current is the net movement of electrons in the bulk medium such as a block of copper.

Can there be current without voltage. Nothere is no current without voltage because according to ohms law VIR where v is voltage I is current and R is resistancewhen V0 then I0 and R0 so not possible without current. There can be voltage without a current. For instance if you have a single charge that charge induces a voltage in space even if its empty.

Voltage in the most physical way is a scalar field that determines the potential energy per unit charge at every point in space. That means that there was voltage just before you measure the current. If you have an ideal inductor or a non-ideal one made with superconducting wire the DC current can indeed be non-zero with exactly zero voltage but that energy has to get in there somewhow either by applying a transient voltage or by inducing it.

There is no minimum voltage. Current will flow as long as there is a difference in potential. In reality if you wish to get into the physics free electrons in copper are in constant motion.

What we measure as current is the net movement of electrons in the bulk medium such as a block of copper. Ohms Law still applies. In a traditional circuit current can not exist without voltage.

Voltage - otherwise called electromotive force - is what compels electrons to move to flow to create a current. Now back to your question why cant there be a flow of current without voltageaka potential difference. Well without potential difference voltage0.

Substitute this voltage value back into the equation to find the currentthe 2nd equation and you get 0resistance. Voltage attempts to make a current flow and current will flow if the circuit is complete. It is possible to have voltage without current but current cannot flow without voltage.

So the first answer is. Yes there can be voltage without current. Current without voltage Current is the flow of charged particles.

Particles are suscpetible to a. Suppose that before the voltage is connected there is no charge or current in the system. Everything will therefore be at the ground voltage.

Now if you connect the voltage source current will want to flow in opposed initially only by the inductor which resists changes in current but not the currents themselves. 5 years ago edited 5 years ago. If theyre not connecting a voltage source through it then theyre changing the magnetic field in the area of the cable with that machine.

This causes a change in the magnetic flux through the shape of the cable which induces a current through the cable. Voltage is the Cause Current is the Effect. Voltage attempts to make a current flow and current will flow if the circuit is complete.

Voltage is sometimes described as the push or force of the electricity it isnt really a force but this may help you to imagine what is happening. It is possible to have voltage without current but current cannot flow without voltage. To answer your question more directly regardless of whether a tiny current flows through the air there can definitely be a voltage between the terminals.

Voltage is another way of describing the electric field. Wherever there is an electric field there is a voltage difference even in a vacuum with no matter at all. Ohms Law confusion – can there be voltage without currentHelpful.

Please support me on Patreon. Now when you connect an open switch and a resistor to the battery the open switch allows infinite resistance to be there in the circuit. Hence the current flowing through the circuit will be IfracVRfracVinfty0 This means no current flows through the conductor.

But the applied voltage has to be there somewhere. It has to be so. You cant run a motor with no amps and you cant apply a larger than nominal voltage to a motor without increasing the amperage.

The suggestions like adding a resistor will just mean wasting power at the resistor and still supply 12 V to the motor itself. Ie if the motor pulls 1A and you size a resistor for 84V of the 96V youll get 12V and. In an inductor one can have a massive current without any voltage as long as it is DC.

In a capacitor you can have big voltage with zero current as long as the voltage is constant. In a combined circuit with RLC driven by an AC sine wave these effects are combined and at certain instants of time there is a finite current with zero voltage. Without reference to two particular points the term voltage has no meaning.

Current tends to move through the conductors with some degree of friction or opposition to motion. This opposition to motion is more properly called resistance. The amount of current in a circuit depends on the amount of voltage and the amount of resistance in.

None of the voltages are greater than the sum of the voltage sources nothing is greater than -20V. There is a 10V difference between V 1 and V 2 just as there should be with a voltage source that forces it. We can tell that we defined the currents I 2 and I 3 backwards making them negative but I 1 and I 4 are both positive.

It can tell you the voltage and current along a wire if you mouse over it. The wire down the bottom reads 455mA and 0V the little yellow dots actually move to show current and the green colouring is voltage. I dont get how that can be.

If there is no voltage how can anything possibly be moving. And if nothing can move that implies no current. Current measurements are made in a different way to voltage and other measurements.

Current consists of a flow of electrons around a circuit and it is necessary to be able to monitor the overall flow of electrons. In very simple circuit is shown below. In this there is a battery a bulb which can be used as an indicator and a resistor.

In this case there is no question of voltage drop along neutral and the potential of N 2 is same as that of N 1. This makes clear that if the supply system is reverted to three phase three wire system the neutral conductor can be removed without any change in potential distribution of the network. You can approximate a current source by using a voltage source and an appropriately sized resistor but its not very efficient especially for an LED as big as 20W.

The projector will have a more sophisticated sort of current source inside it and its the current and voltage output from that that you need to measure to know the power of the.