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S

Secondary

Winding that is connected to the load


Series

A series of things or events is a number of them that come one after the other.


sine

Reactance divided by impedance


solenoid

an electrically operated actuator


Star

Three phase with one end of each phase connected to each other at one point. so that it looks like a pretty star. 

Υ


Step down

Decrease voltage using a transformer


Step up

Increase voltage using a transformer 


Supply

Electrical energy source 


Synchronized

Moving. but doing the same thing at the same time.
Think; synchronized swimming.