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why do we need transformers?

Answer Posted / rahul

all the answers above are correct...

Step up, step down
protect the main connection
Variable transformer- to reduce the starting load.
Isolation transformer - to prevent the machines from getting damaged from spikes as transformers filter them.

all these answers must be answered simultaneously to describe the transformer completely... & i really dont know which is saying the answers above that of mine are wrong.. they are right but are partially answered

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