Johnson Controls Hitachi Air Conditioning Maintenance Department Technician Interview Questions and Answers

A transformer is an electrical device that transfers electrical energy between two or more circuits through electromagnetic induction.

• Transformers are used to increase or decrease the voltage in electrical power transmission and distribution systems.

• They consist of two or more coils of wire, known as windings, which are wound around a core made of magnetic material.

• Transformers are commonly used in power substations, e...read more

A motor is a device that converts electrical energy into mechanical energy, while a stator is a stationary component of a motor.

• A motor consists of a rotor and a stator, with the rotor rotating inside the stator.

• The stator is responsible for producing a magnetic field that interacts with the rotor to produce motion.

• The stator is typically made up of a series of coils of wire that are arranged in a specific pattern.

• Exam...read more

Voltage is the measure of electric potential difference between two points in an electrical circuit.

• Voltage is measured in volts (V)

• It is the force that drives electric current through a circuit

• Higher voltage means more energy is available to move electrons

• Voltage can be either AC (alternating current) or DC (direct current)

• Examples of voltage sources include batteries, generators, and power outlets