Page Banner

Simple Definitions

The most important electronics terms, demystified in one place.

Imaginary numbers

Our Take

If you take i and square it, you get a -1. Let’s go over that again: i*i = -1. As that’s not possible, it’s imaginary, which is why it’s represented by the letter i. However, in electrical engineering, "i" represents current, so we use the letter "j". In a graph, we represent the real numbers on the x-axis and the imaginary numbers on the y-axis, and when calculating impedance, imaginary numbers are a great way to show the varying resistance at different frequencies.

Make Bread with our CircuitBread Toaster!

Get the latest tools and tutorials, fresh from the toaster.

What are you looking for?