Electrical Maintenance Supervisor Interview Questions and Answers for Freshers

AC current changes direction periodically while DC current flows in one direction only.

• AC current is used in household appliances and power grids while DC current is used in batteries and electronic devices.

• AC current can be easily transformed into different voltage levels using transformers while DC current requires a converter.

• AC current is more dangerous to humans than DC current due to its ability to cause muscle contractions.

• DC current is more efficient for long-distance...read more

A transformer is an electrical device that transfers electrical energy from one circuit to another through electromagnetic induction.

• Transformers are used to increase or decrease voltage levels in electrical circuits.

• They consist of two coils of wire, known as the primary and secondary coils, wrapped around a magnetic core.

• When an alternating current flows through the primary coil, it creates a magnetic field that induces a voltage in the secondary coil.

• Transformers are used ...read more