Safety Interview Question & Answer

Marking a hole or tunnel by digging the ground by man or machine is called excavation.

It is a temporary platform constructed for supporting both  men and materials and working  safety at a construction site.

The process of joining metals either by electrical or by gas is called welding.

The process of joining of cutting metals by using oxygen and combustible gas is called gas cutting

•    Electrical Charge

Electricity is the movement of electrons.  Electrons create charge, which we can harness to do work.  A light bulb, etc., are all harnessing the movement of the electrons in order to do work. They all operate using the same basic power source: the movement of electrons.

The three basic principles for this tutorial can be explained using electrons, or more specifically, the charge they create:

•    Voltage is the difference in charge between two points.

•    Current is the rate at which charge is flowing.

•    Resistance is a material’s tendency to resist the flow of charge (current).

So, when we talk about these values, we’re really describing the movement of charge, and thus, the behaviour of electrons. A circuit is a closed loop that allows charge to move from one place to another. Components in the circuit allow us to control this charge and use it to do work.

V = Voltage in volts

I    = Current in amps

R = Resistance in ohms