Presto Stantest Interview Questions and Answers

Electricity is the flow of electrons through a conductor.

• Electricity is a form of energy that powers most of our modern devices.

• It is created by the movement of electrons from one atom to another.

• Electricity can be generated by various sources such as coal, wind, solar, and hydro power.

• It can be dangerous if not handled properly and can cause electric shock or fire.

• Electricity is measured in units of volts, amps, and w

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 voltages while DC current cannot be transformed easily.

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

• DC cu...read more

Transformers are electrical devices that transfer energy from one circuit to another through electromagnetic induction.

• Transformers are used to increase or decrease the voltage of an alternating current (AC) power supply.

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

• When an AC voltage is applied to the primary coil, it creates a magnetic field that...read more