Classification of Types of Measuring Instruments

The electrical and electronic measuring instruments can be broadly classified into following two types.

• Absolute instruments and
• Secondary instruments

Absolute Instruments

These are the instruments which give the value

Channel Type or Direct Core Type Induction Furnace

The direct core type induction furnace is a type of core type electrical heating furnace works at low frequency. It is used to melt metals. The furnace is similar to that of a transformer in which the primary circuit is a winding for electrical supply and the secondary circuit is a single turn

Electric Welding

Electric welding is a process of joining metal pieces with the use of electrical energy. The electricity is used to generate heat energy which melts the metals pieces in order to join the work pieces. 

Classification of Electric Welding:

The electric welding is mainly classified into two types based on the manner in which the heat energy is produced such as

Spot Welding

Spot welding is a method of resistance welding in which the joining of two metal surfaces is done by the heat obtained from resistance. to the flow of electric current.

In spot welding both the work pieces to be joined are held together between copper or copper alloy electrodes. The electrode tips were spaced

Resistance welding

Resistance welding is a type of electrical welding in which the two metals pieces are joined with the help of heat produced due to the resistance offered at junctions joining the two metals. This heat makes the metal pieces melt at the junction and thereby joining together.

The amount of heat energy produced