Which of the following electrical equipment utilizes the effects of mutual induction?

The transformer is an electrical device that operates based on the principle of mutual induction. This principle involves the transfer of energy between two coils of wire through a magnetic field when an alternating current flows through the primary coil. The changing magnetic field induces a voltage in the secondary coil, allowing for the transfer of electrical energy and the ability to step up or step down voltage levels.

In contrast, electric motors convert electrical energy into mechanical energy but operate primarily on the principles of electromagnetic induction and not mutual induction specifically between separate coils. Resistors are simply components that resist current flow and do not utilize induction principles. Capacitors store electrical energy in an electric field and also do not rely on mutual induction for their operation.