Tann Utility Services Electrical Technician Interview Questions, Process, and Tips

To calculate battery backup hours, divide the battery capacity by the load power consumption.

• Determine the battery capacity in ampere-hours (Ah)

• Determine the load power consumption in watts (W)

• Divide the battery capacity by the load power consumption to get backup hours

• Example: Battery capacity = 100Ah, Load power consumption = 50W, Backup hours = 100Ah / 50W = 2 hours

Current is the flow of electric charge through a conductor.

• Current is measured in amperes (A)

• It is caused by the movement of electrons or ions

• Current can be direct (DC) or alternating (AC)

• Ohm's law relates current, voltage, and resistance

• Examples of current include the flow of electricity in a circuit or the movement of ions in a battery

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.

• There are two main types of transformers: step-up transformers, which increase voltage, and step-down transformers, which decrease voltage.

• Other types of transformers inclu...read more

Types of transformers include power transformers, distribution transformers, autotransformers, isolation transformers, and instrument transformers.

• Power transformers are used in high voltage transmission systems to step up or step down voltage levels.

• Distribution transformers are used to supply power to residential and commercial areas.

• Autotransformers have a single winding and are used for voltage regulation.

• Isolation...read more