An electric motor driven by alternating electric current.

A dynamic pump that contains impellers provided with vanes to generate centrifugal force to achieve the required pressure head.

A lifting appliance that is a tower or derrick equipped with cables and pulleys that can lift or lower and move loads in multiple directions.

A power transformer of which the magnetic circuit and windings are not immersed in an insulating liquid.

A transformer that, by electromagnetic induction, transforms a system of alternating voltage and current into another system of voltage and current usually of different values and at the same frequency for the purpose of transmitting electrical power.

A power transformer of which the magnetic circuit and windings are immersed in oil.