Difference between Current and Voltage

Current vs. Voltage

What is Difference between Current and Voltage? When talking about electricity, the concepts “current” and “voltage” are very important; however, many are unaware that they are dealing with different things and tend to use them to refer to the same thing.

Difference between Current and Voltage

Both the current and the voltage are related to each other. A voltage cannot exist without a current and a current must have a voltage, but it is necessary to understand the difference between current and voltage. For this, we describe below what the current and voltage consists of and what makes them different.


The electric current or current is the flow of electrons passing through a material in a unit of time. These electrons must pass through an electric conductor to produce a charge.

In a circuit, the charge is produced by electrons passing through a conductor or cable. I also started producing them by ions in an electrolyte or by ions and electrons.

Electrical currents can cause effects like heating and magnetic fields. Ohm’s law states that “current through a conductor is directly proportional to the potential difference across the two points of that conductor.”

Current is measured in amperes. The name of this unit of measurement is due to the physical and mathematical André-Marie Ampere. An ammeter is used to measure current amps.

There are several types of currents among which stand out: the direct or continuous current and the alternating current. The first occurs when the electrons flow without changing direction, as in the case of batteries, solar panels … whereas the alternating current is one in which the direction of the electrons is kept in constant change.


It is the electric power between two different points. It could also refer to the electrical potential energy difference of a unit test load carried between two points.

A voltage can represent a source of energy or it could represent the lost, used or stored energy. It is also referred to as electrical voltage and refers to the pressure capable of pushing the electrons along a circuit.

To simplify the definition of these two concepts, imagine that you have two water tanks and a tube that is placed to connect them. E l tank having more water will automatically flow into the tank is less?

The rate at which water flows is similar to the flow of electrons that cause a current. If the pipe connecting the two tanks is small, it will result in increased resistance and less water will travel through it; however, if it is wider, there will be less resistance and more water will flow from one tank to another. This is how electricity actually works.

The air pressure pushing the water from one tank to another is the voltage, whereas the water (which is being the electrons) creates a current. Finally, the tube (conductor) is the tube through which the electrons travel.

The mathematical equation to represent this relation is I = V / R, where I is the current, V is the potential difference between two points and R is the resistance, which is measured in ohms. According to the Law of Ohm, the R in the relation is always constant, independent of the current.

According to experts, it is not high voltage that kills a person when electrocuted, but the amount of current that flows and reaches the heart. So if the voltage is high, but the current is low; there is more likely that one person can survive, otherwise; it is very likely that the person will die. This is one of the reasons half of which seeks to explain the fact that static electricity does not kill us. This type of electricity is measured at high voltages, but does not induce high current flow.

Major Differences between Current and Voltage

  • Current is the rate at which the electric charge flows past a point in a circuit, while the voltage is the difference in charge potential between two points in an electric field.
  • The unit of current is the ampere, while that of the voltage is the volt.
  • The current is measured with an ammeter, while the voltage is measured with a voltmeter.
  • The current is the effect, the cause of which is the voltage.
  • The current can create a magnetic field, while the voltage can create an electrostatic field.