Maths & Physics Teacher Interview Questions and Answers

A rectifier is an electrical device that converts alternating current (AC) to direct current (DC).

• Rectifiers are commonly used in power supplies to convert AC voltage from a wall outlet to DC voltage for electronic devices.

• There are different types of rectifiers such as half-wave rectifiers, full-wave rectifiers, and bridge rectifiers.

• Rectifiers typically consist of diodes that allow current to flow in only one direction, effectively converting AC to DC.

• Examples of rectifiers...read more

A transistor is a semiconductor device used to amplify or switch electronic signals and electrical power.

• Transistors have three terminals: emitter, base, and collector.

• They can be used in amplifiers, oscillators, and digital circuits.

• Common types of transistors include bipolar junction transistors (BJTs) and field-effect transistors (FETs).

Velocity is the rate of change of an object's position with respect to time, including both speed and direction.

• Velocity is a vector quantity, meaning it has both magnitude and direction.

• It is calculated as the displacement of an object divided by the time taken to cover that displacement.

• Velocity can be positive, negative, or zero depending on the direction of motion.

• For example, a car moving east at 60 km/h has a velocity of +60 km/h in the east direction.