If the secondary coil of a transformer has more coil turns, how does it affect the voltage?

When the secondary coil of a transformer has more turns of wire compared to the primary coil, it results in a step-up transformer. This means that the voltage in the secondary coil will be higher than the voltage in the primary coil.

The reason behind this lies in the principle of electromagnetic induction and the transformer equation, which relates the number of turns in the coils to the voltage. Specifically, the voltage ratio between the primary and secondary coils is directly proportional to the ratio of the number of turns. Therefore, increasing the number of turns in the secondary coil increases the voltage it produces, assuming the primary coil is energized with a certain input voltage.

In practical terms, if you have a transformer where the secondary has more turns, it effectively increases the output voltage, which is particularly useful in applications where higher voltage is necessary for efficient power transmission or operation of devices.