difference between voltage and current source

Difference Between Voltage And Current Source

As far as electricity is concerned, two fundamental quantities must be considered. One is voltage, and another is a current source. We will take a look at the difference between the current source and voltage source and understand both the terms better: 


The first point of difference between the two is their definition. If we talk about current, it can be described as the rate at which electric charge flows through a point in a circuit. To put it in simple terms, it is the rate of flow of electric charge.

Now, if we talk about voltage force, it can also be referred to as electromotive force. It is the difference between two points in an electrical field. So if we look at current force and voltage force side by side, the former is the rate of flow of charge while the latter is energy per unit charge. 


The units in which current force and voltage force are measured are different as well. Current force is measured in A or amps or amperage. Meanwhile, the unit to measure voltage force is V or volts or voltage. 


There’s a great relationship between current force and voltage force, but it also brings a strong differential point between the two terms.

If we study both of them side by side, voltage is the cause while current is the effect. There’s no way that current can flow without voltage. It means that there’s no existence of current if there’s no voltage. But voltage can exist without current. 

Measuring Instrument And SI Unit 

The instrument to measure current is Ammeter, while the instrument to understand voltage is Voltmeter. As far as the SI unit goes, it is 1 ampere = 1 coulomb/second for current. Meanwhile, it is 1 volt = 1 joule/coulomb when it comes to voltage. 

In Series & Parallel Connection 

There’s a big difference between the series & parallel connection of the current source and voltage source. Current would remain all the same through all the components in the series while voltage can get interrupted throughout the series. It is the opposite in the case of parallel connection as current force can get disturbed through all the components in the series while voltage remains the same. 

If we talk about the importance of current force and voltage force, both elements are integral parts of electricity. If we are talking about the operation of a circuit here, both of them are two aspects of the same thing.

When we get an overall analysis of things, voltage is the pressure here. It doesn’t mean that voltage is more important, it’s just that it is easy to measure voltage. This is going to be the driving force for the behaviour of the circuit. Current is the effect of the response from such pressure. They are linked together and complete each other. 

If there’s no voltage, there’s no pressure and eventually, there’s no current. If there’s no induced current, no voltage can be generated. 

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