A Transformer

B. Identify appliances/equipment that require transformers.

All the appliances which are functioning or dependent to electricity has a transformer or required a transformer.

This are examples of appliances that requires appliances

C. Relate the voltage and current in the primary and secondary coils to the numbers of turn in each.

Hence the step-up transformer has a great loop in secondary coil, so in step-down transformer has a less amount of loop in a secondary coil. So the induce voltage of the step-up transformer is greater than the other. So as a whole if the secondary coil loops is increases the greater the induce voltage and the primary coil reduces its induce voltage with same as vise versa.