What winding is connected to the load?

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In a transformer, the winding that's connected to the load is the secondary winding. The primary winding is tied to the source of electrical energy, and the secondary is where the transformed voltage and current are delivered to the load through magnetic coupling in the core. The turns ratio between primary and secondary determines whether the voltage is stepped up or stepped down for the load. Auxiliary and tertiary windings exist for other purposes, such as providing power to control circuits or additional voltage for special functions, but the load normally connects to the secondary.