Final answer:
A transformer with more turns on the secondary winding than on the primary is known as a step-up transformer, which increases voltage from the primary to the secondary.
Step-by-step explanation:
If there are more turns of wire on the secondary windings of a transformer than on the primary, the transformer is called a step-up transformer. Transformers are devices that use induction to transform voltages from one value to another. The voltage across the primary and secondary coils is related by the transformer equation, which states that the voltage ratio between the secondary and the primary is the same as the ratio of the number of turns on the secondary winding (Ns) to the number of turns on the primary winding (Np).
A step-up transformer increases voltage from the primary to the secondary, which means it has more turns on its secondary winding than on its primary winding. Conversely, a step-down transformer decreases voltage from the primary to the secondary and has fewer turns on the secondary winding compared to the primary winding.