Which component of a transformer has more turns in a step-up configuration?

In a step-up transformer, the design is specifically intended to increase the output voltage relative to the input voltage. This is achieved by having a greater number of turns in the secondary coil compared to the primary coil.

The relationship between the number of turns in the coils and the voltages is governed by the transformer equation, which states that the ratio of the primary voltage (V_p) to the secondary voltage (V_s) is equal to the ratio of the number of turns in the primary coil (N_p) to the secondary coil (N_s). This can be expressed as:

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

In a step-up transformer, the secondary coil (N_s) has more turns than the primary coil (N_p), allowing it to step up the voltage. For example, if the primary coil has 100 turns and the secondary coil has 200 turns, the voltage across the secondary coil will be higher than that of the primary, thus fulfilling the purpose of stepping up the voltage.

As a result, the correct answer is that in a step-up transformer, the secondary coil possesses more turns than the primary coil.