In a transformer, what effect does increasing the number of turns in the primary coil have on voltage?

In a transformer, the relationship between the number of turns on the primary coil and the voltage can be understood through the principle of electromagnetic induction and the formula that relates voltage and turns ratio. Specifically, the voltage in the transformer is proportional to the number of turns in the coils.

When the number of turns in the primary coil increases, it induces a greater voltage when compared to a coil with fewer turns, given a constant magnetic flux. This relationship is described by the formula:

[ \frac{V_p}{V_s} = \frac{N_p}{N_s} ]

where (V_p) and (V_s) are the primary and secondary voltages, respectively, and (N_p) and (N_s) are the number of turns in the primary and secondary coils. Therefore, increasing (N_p) directly increases (V_p) if the secondary turns (N_s) remain the same.

This principle is foundational in transformer operation, as it allows for steps up or down in voltage to be achieved based on the configuration of the turns in each coil. Hence, having more turns in the primary coil correlates with a higher primary voltage, aligning with the selected answer.