Learn the basics of Electrical Engineering.

Polarity of Voltage and Direction of Current

Polarity and direction are two basic concepts that are associated with electrical components. In this post, you'll learn the basics of voltage polarity and direction of the current.

The term polarity refers to the voltage and operators +, - indicate them.
The direction of current represents the flow of electricity. An arrow symbol → indicates the directional flow of current.

Let's start our learning from the simple Ohm's law circuit:
Here the direction of current represents the flow of charge from + ve terminal of the battery towards the -ve terminal. While indicating the polarity two points should be kept in mind:
  1. The tail of current with voltage source has negative polarity.
  2. The tail of current with resistor has a positive polarity.
While indicating the polarities remember the above two points and you can solve any circuit.

Let's consider these four examples.

And the answer is:


  1. When you apply current independently to two separate coils. One wound clockwise and the other counterclockwise wise. Does or will the coils indicate opposite polarity to each other?