Transformer Calculator
Find Secondary Voltage
Find Required Turns
Formula
Vs/Vp = Ns/Np = Ip/Is, where V is voltage, N is number of turns, I is current, p is primary, and s is secondary.
Frequently Asked Questions
How does an ideal transformer work?
An ideal transformer converts AC voltages by electromagnetic induction. The voltage ratio equals the turns ratio: Vs/Vp = Ns/Np. Power is conserved, so Ip/Is = Ns/Np.
What is the difference between step-up and step-down?
A step-up transformer has more secondary turns than primary turns (Ns > Np), increasing voltage. A step-down transformer has fewer secondary turns, decreasing voltage.