What is the square root of -1?

the square root of -1 is i

Step-by-step explanation:

Unit Imaginary Number

The "unit" Imaginary Number (the equivalent of 1 for Real Numbers) is √(−1) (the square root of minus one). In mathematics we use i (for imaginary) but in electronics they use j (because "i" already means current, and the next letter after i is j).