A step-up transformer has a ________ number of turns in the secondary coil compared to the primary coil.

A step-up transformer has a ________ number of turns in the secondary coil compared to the primary coil.

• A. Lesser
• B. Equal
• C. Greater
• D. None

Answer: (C)

A step-up transformer is designed to increase voltage from the primary coil to the secondary coil. This is achieved by having a greater number of turns in the secondary coil compared to the primary coil. According to the transformer equation, the ratio of the voltages between the primary and secondary coils is directly proportional to the ratio of the number of turns in those coils. Therefore, if the secondary coil has more turns, it will produce a higher voltage than what is supplied to the primary coil.

In contrast, a step-down transformer would have fewer turns in the secondary coil, resulting in a lower voltage output. A transformer with equal numbers of turns in both coils would produce the same voltage on both sides, making it neither a step-up nor a step-down transformer. Hence, the key characteristic of a step-up transformer is precisely the greater number of turns in the secondary coil, which facilitates the increase in voltage.