Turns ratio of a transformer is defined as the ratio of which of the following?

The turns ratio of a transformer is defined as the ratio of the number of turns of wire in the primary coil to the number of turns of wire in the secondary coil. This ratio is crucial because it directly influences the voltage and current in both coils. In a transformer, the voltage induced in the secondary coil is proportional to the turns ratio; that is, the greater the number of turns in the secondary coil as compared to the primary, the higher the voltage output.

While other choices relate to current and voltage, they do not accurately describe the turns ratio. Understanding the relation between the number of turns and both the primary and secondary voltages allows you to calculate how a transformer modifies energy from one circuit to another. This principle underpins transformer design and operation, emphasizing the importance of the turns ratio in determining output characteristics.