Additionally, depending on the size and configuration of the primary and secondary coils, the voltage and current induced in the secondary coil can be different than the primary coil, allowing the vol...Additionally, depending on the size and configuration of the primary and secondary coils, the voltage and current induced in the secondary coil can be different than the primary coil, allowing the voltage and current to be "transformed" to different values. In audio, we use transformers in microphone preamplifiers and other audio electronics and to distribute amplifier power to the loudspeakers in 70-volt and 100-volt distributed systems.
