Final answer:
Both step-up and step-down transformers operate on mutual induction, essential for efficient power transmission and distribution in the electric power industry.
Step-by-step explanation:
The transformers that operate on mutual induction are both step-up transformers and step-down transformers. A step-up transformer works by increasing voltage and decreasing current to transmit power over long distances with minimal loss, while a step-down transformer does the opposite by decreasing voltage and increasing current when delivering power to homes and businesses.
Transformers utilize electromagnetic induction to transform voltages from one value to another. This is a fundamental principle in the electric power industry, where power transformers are used to either increase or decrease the voltage for efficient power transmission and distribution.