Conductor thickness How much current can flow through a wire is determined by its thickness.
The number of turns in the primary winding is more than the secondary winding.
Step-down transformer: many turns :few turns.
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Power Transformer Conversely, a transformer designed to do exactly the opposite is called a step-down transformer.
The voltage applied to the primary of the coil magnetise the iron core which induces the secondary windings of the transformer.
But in the transformer for transmitting the equal amount of power, if we raise the voltage, the current will be reduced and vice versa.
Why use step up transformers? This transformer acts as a step-down unit, converting a high voltage, low current supply into a low voltage, high current supply.