u mean by using transformer??? Be specific in ur question.......
If its transformer the principle is mutual induction
Two types:
1.step up-increase emf/current
2.step down-decrease emf/current
If its transformer the principle is mutual induction
Two types:
1.step up-increase emf/current
2.step down-decrease emf/current
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If u talking about source transformation then..
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increasing or decreasing the voltage/current that is changing it.